I'd wager that the Main Street USA projections will serve as an extension of what's projected on the Cinderella Castle. The experience could be better from further back, but it's unlikely anyone is missing out by being in front of Main Street USA.
This matches what was offered previously. We thought the seating area offered poor viewing, so we did the Plaza viewing where the desserts were before the fireworks. Great spot to view Happily Ever After.
I'm slightly surprised by how little this actually changes. It's a price increase and a perk removed. I assumed they'd try to change more when they had the chance. Oh, and the names for these things make no sense at all.
Looking forward, this does place more pressure on the attractions with the Individual Attraction pricing. As in, the guest is going to expect a fantastic experience if they paid $15+ just for a single ride. That won't go over well if the ride's effects aren't working, etc (looking at you Rise of...