I'm pleased to see the rebates even though I paid full price for the RF glass I already bought - Canon really is serious about the new mount.
I honestly think those complaining about the price should remember that Canon, like Nikon, nearly always does this with new lenses, ie charge a high price at introduction. Plus R&D costs will be higher this time with the whole new mount. The only obvious exception I can think of in recent years was the EF 85L IS and that was a situation where Sigma had a really highly regarded 85/1.4 Art at a very competitive price. In the RF mount Canon has no competition at the moment.
Regardless we must remember that Canon has a long standing policy of gradually reducing the price and in time many older but top class L mount lenses become quite good value. It's a sensible way to keep loyal customers. However it does mean that the new mount doesn't have lenses in that bracket. But look today at the price of the EF 135L or EF 24-70L II - both can be adapted to the R and there's very little size penalty versus the new RF glass in the case of the 24-70. You get a lovely classic 135 that might not be the absolute sharpest any more but has a gorgeous rendering and you get the world's best 24-70 (perhaps it will lose that crown to the RF 24-70 IS soon, time will tell; it's still better than anything Nikon, Sigma, Sony or Tamron have made in the 24-70 market) - all for a very reasonable price. Splash out on the control ring adapter and you even get the same extra functionality of the new lenses. Really I think it's a good way to go for those wanting to try mirrorless and is so much better than the position Nikon users are in where the old glass is very hit and miss on the Z bodies. For me the best thing has been to use the EF 50L on the R - what a revelation that lens is when you get perfect focus at f/1.2 anywhere in the frame. Even with the adapter it is considerably smaller than the new RF 50L. If you like a 50 for dreamy portraits and unique rendering the EF lens is the way to go anyway and it's now for sale at a very fair price or you can find barely used ones second hand as so many people don't take the time to learn how to use it or get frustrated with its focus quirks on an SLR.
So really, anyone worried about spending too much my advice is give it a little time and enjoy all the world class EF L mount glass the early adopters are selling to fund their GAS