And I agree with you. However you didn't convince me that Nilfgaard will be better off without Emhyr. And I will also react to this post from another thread:
To sum it up, you think that:
1) Nilfgaard will be better off without Emhyr
2) North (Temeria and Aedirn included) will be better off under Dijkstra's rule.
3) The Northern Empire and the Southern Empire can develop peace as equals now
What would happen (my opinion):
1) Emhyr is assassinated, Morvran becomes his successor. Now he is 20 years old, inexperienced, his predecessor was deposed. He has no other choice than to become the puppet of the Nilfgaardian nobility and the Trade Corporation who manipulate him. Why this should be better than Emhyr's rule?
2) Nilfgaardians leave Temeria and Aedirn. Dijkstra does exactly what they would do - industrialization. He basically builds second Nilfgaard, backed by spies and propaganda. Temeria instead of becoming vassal state of Nilfgaard becomes merely province of Redania.
You despise Emhyr, but Dijsktra is just like him. Ruthless patriot who is willing to do everything for Redania. The only difference between him and Emhyr is that he was not born as the future Emperor. And that Emhyr does not backstab Roche and Thaler.
3) Peace? Really? There will be two empires, who hate each other (Nilfgaardians feel superior and Nordlings want revenge), both with massive propaganda. Furthermore Nilfgaard will soon have problem with overpopulation. Sooner or later there will be another war and people from Sodden, Brugge, Lyria and Rivia will suffer again. That's so cruel!
Btw nice discussion.
My general thoughts on the subject is it depends very strongly on what each monarch intends to derive from the countries involved. Dijkstra's campaign of resettlement seems to be because he's trying to either mix up the locals or he's trying to solidify the control of Redania in the region but everything we get from him indicates he's not so much invested in the Redanian PEOPLE as Redania itself. His lengthy speech indicates that, for his many many faults, Dijkstra believes that the purpose of a nation is to benefit the people. He wishes to create a modernized economic state with Sorcerers and Nonhumans both having a place in society, which provides all of the benefits of Nilfgaard.
The big difference that Dijkstra brings to the region amongst other things is that the Nilfgaardians practice apartheid due to their belief in the Elder Blood being so terribly damn important. Dijkstra, by contrast, believes that mages, humans, nonhumans, and so on are all equal and will be able to be equal in Redania without being of a mixed Elf-Human ancestry. They also speak the same language as each other as well as practice a shared cultural set of traditions. Albeit, all indications are Dijkstra is not going to be too kind to the Eternal Fire.
Temeria is, bluntly, better off underneath Nilfgaardian rule as it's not going to be assimilated and will still have all the benefits of Nilfgaardian trade and protection. It couldn't get a better deal than this other than independence (or rulership over the region as Foltest had intended). However, everyone else BUT Temeria is going to get a better position from this. Also, Temeria wasn't exactly in a great position under Nilfgaard in certain areas as well. We've seen Nilfgaardian rule of Temeria was done with Temerians to begin with.
The Bloody Baron was their man in Velen and he was a horrible tyrant (through inaction) with his successor being worse. So there's going to be some downsides to Nilfgaard rule, even if the fact that the ending clearly implies things get better with time rather than worse.
But the big question is
what does Nilfgaard/Redania want from the North? Imperialism is generally not about expansion and assimilation. People do not invade regions to make them equal citizens of society and the Nilfgaard seem very likely to exploit the regions they conquer (as we see in both White Orchard and Velen) with the aforementioned apatheid. Temeria doesn't suffer this because of their deal but other lands certainly will. Dikjstra's campaigns of resettlement seemed designed to PREVENT this, however, but we don't know who is being resettled where so I can't say for sure but am just guessing from his motive rant.
Is Nilfgaard there to make Northerners equal in their realm?
Or is it there to exploit the locals?
Are the Redanians?
Is this any worse than the local lords are currently doing? Velen, certainly, is a craphole even under "Free" Temeria with widespread starvation.
Nilfgaard is wiping out local religions according to the drunk in White Orchard, which sucks for Melethil but would be good in Velen and Novigrad.