Oh yeah sure, game developers already favour consoles and mobiles for less development costs-efforts. Now after more domination, Nvidia will make it further harder with enforcing unnecessary stuff like RT RT and probably charge them for that as well and with making graphics card more expensive you will sure live the best years of PC gaming in next years
As I said, that is a narrow view of the market. The amount and variety of games getting a PC release is staggering these days and higher than ever before, and the quality and originality of games is at a pretty high level.
There are segments in each market and gaming is no different. Yes, mobile gaming is the biggest growth market, but PC gaming has also shown growth YoY for quite some time now - despite a decline in overall PC sales. That says a whole lot more than the price of a new GPU gen.
Another important thing is backwards compatibility. Old games are still very popular, and any time there is a lack of new interesting content, PC gamers can and will fall back to (heavily modded) older games very easily. The tank is simply never empty and commerce can suck on it. Why else do you think they want us to go about Stadia/streaming and always online?
But anyway - there IS interesting new content, and its more varied than it ever was, so yes, if you open your eyes and look outside your filterbubble for a bit, there are many gems to be had. And most of those run very well on relatively weak GPUs too.