If they could make a " "L" class RF 24-240 f4, Canon" with (hopefully) a close focus & good max magnification, then I'd buy it as well. I'd even pay good money for it, maybe $4 or 5K. If I ever wanted a single lens & camera walk around combo, it would be this lens on my R5.I could afford this lens if I could justify it. But, as much as I'd love to, I really kind of can't. Yes, it's considerably faster than my RF 100-500. Yes, it is considerably longer reach than my RF 70-200 2.8. Yes, it is more versatile than my EF 300 2.8. But is costs almost as much as all three of those put together (3 good copies on the used market), is almost as long as the 300 2.8 plus the 70-200 2.8 end-to-end (!), and, overall, is about as subtle as a train wreck. (And, I don't need to compensate for a micro-phallus).
A zoom is for walking around, and unexpected shots. (If you know what you're going to shoot, you take a prime). For walking around, this lens would make an elephant jealous. I just don't see myself walking around with it. In the forest and beach it'll get abused/damaged, and, in the city, I'll probably get mugged for it. (Although it might serve as a decent self-defense weapon). The market for this lens is small and totally niche- (1) indoor fast action, and, (2) people with a crap ton of Bitcoin. In today's world, that probably means it'll be a screaming success. But... I'll wait for a good used copy, for sure.
However, make an "L" class RF 24-240 f4, Canon, and I'll pre-order 3 of 'em... But, until such time, I think I'll start walking around with:
1. RF 70-200 2.8 on an R7 crop body (effectively 112-320mm f/2.8) and,
2. RF 24-105 f/4 on an R5.
That's 24-320mm- with only the added $1500 purchase of a small R7 body and no lens changes.
Not too shabby!
No lens changes while walking around (except the occasional 14-35 onto the R5 and 600 f/8 onto the R7 (960mm!!!). And, all would fit easily in a medium sized over the shoulder carry bag.
Change my mind...
Oh, and the 70-200 f2.8 on a crop body would be equivalent to full frame 112-320mm f4.5, which is still good. Of course, I'd still put it on an R5 and then you can crop the inner box yourself (the photo would be pretty close in IQ) and always get the option of the fuller (wider) view when needed.