It's already super-cheap compared to the past. I can remember seeing a basic 2-channel AM radio with servos for about $250 back in the early 70s.

And there are lot of decent entry level RTRs that any teenager can afford (between $200 and $300) if he goes and mows a few lawns, or delivers papers, or even collects cans and bottles from the trash.

Only thing I would like to see a bit cheaper would be fuel. Not that it's unaffordable, but it seems priced too high for what it is. But there's ways around that such as making your own.