I think this is a problem of attitude. If you are so desperate for something new, why not create it yourself? The indie has every right to do what they feel like with their content, time, energy & money. They're not your monkey to dance & sing whenever you please. If you disagree with how they're spending their time, then spend your time making something you'd rather see.
And yeah, they of course have the right to make what they want and I can in no way take that away from them. Remaking the same game might even be worth it, financially. But it doesn't build value like getting going making new IP can, and it doesn't give me something exciting and new to play. I'm allowed to ask, they don't have to give it to me.
I get the idea that you like to see new concepts, but I don't get why you'd complain about people polishing old ideas. You suggest that it's keeping them from working on new ideas but just because something is new, doesn't mean it's good. Not every new thing someone puts out is gold. If they have a proven winner, then they should push & see how far they can take it.
And as a customer, I'm more interested in new awesomeness than addaddons.