I'd happily pay for the new game even though we aren't getting the update anymore. The dev more than deserves it. However, a lot of people around here feel weirdly entitled about these things and get super pissy when they have to pay a dollar or two, so whatever.
The developer is under no obligation to make the new game free to buyers of the old one. I more then got my monies worth from 10000000 and will also happily buy his Boat game.
If he launches it free for a day, I hope he puts in a $1 donation IAP for those who wish to support him
I'm really looking forward to this game! I kind of hope he doesn't release it for free, because that just seems silly. But... If he does, I hope he figures out a way to make that work for him. It should be good publicity, I suppose.