I disagree. To me, the ending feels like one big cliffhanger and can pretty easily be continued. There are basically 2 different outcomes:
- Death
- 6 months to live
The endings resulting in V's death would obviously not be continued.
The 6 months endings could all lead to the same result:
- The space heist. You do a small mission, in exchange, Mr.Blue Eyes tells you where you can find a cure
- Nomad. You meet Panams contacts, they tell you where to find a cure.
- Arasaka and back to earth. You meet someone else (maybe Mr. Blue Eyes), who tells you where to find a cure.
All 3 branches would be one again.
It's not about a sequel, it's about the single-player expansions they talked about. Continuing V's story makes way more sense than introducing a new character or adding mid-game content when the story already leads to sidequests being ignored.
They need to figure this out, or they only have Witcher as a franchise, that would not be good.