If you have average points of 10 and make a card with 12 instead, why would i even use the 10? Even if you tierlisted it with supply costs, it would be simple math to find the maximum.
Yes and no. There will be an average based on the provisions and anything below that will be deemed inefficient (or too costly). What remains the same is that there will be "bad" cards no one plays; Pre-Homecoming because you have better cards, in Homecoming because other cards are cheaper.
However, you will have more flexible slots. Sometimes you want to fill those slots with 2 cheap cards and 1 expensive one, the other times you might want 3 average cards. Each provision tier will have its champions, but the tiers on their own do not automatically work in every deck. In theory, this should give much more variation in decks. In practice, netdecks will remain.