I don't know why is this discussion about changing the EF lenses once you buy a Canon mirrorless camera?! Give me an EOS R and I will shoot a wedding anytime using the adapter and EF lenses next to other photographers that shoot with 5D Mark IV, D850, A7R III, K1. I don't need to change the EF lenses to RF lenses as long as EF lenses work really well on EOS R with the adapter.
You can "cheat" these days using different softwares for noise reduction, for stalking, for sharpening, etc. in order to offer to clients the best images from the RAW files but you can't fake emotions at a wedding or at an event where you try to be as discrete as possible. And emotions don't have anything to do with the number of megapixels, with 15EV of dynamic range, etc. Is EOS R better or worse than my 5D Mark IV? I really don't care as long as EOS R is fun to use and it doesn't slow me down with EF lenses.
Does Canon deserve the number one or not? It's really not my problem as long as their system is solid, their service is very fast, the support of third party is very good, their lenses are excelent, etc. I don't mind if Canon will be the second, the third or the fourth in the next 10-20 years as long as it offers me all I need to get my job done without the need to find walk arounds.
Does Sony deserve no.1? They can have it as far as I'm concerned. But as long as EOS R has way better ergonomics than A7 III or whatever Sony camera is in the same price range and as long as the viewfinder is again better than the 3rd generation of Sony cameras... I rather stay with Canon because again it's a lot more fun to use than Sony.
Does Pentax deserve no.1? They can have it. But as long as Pentax it's almost non existent in Romania and this means that service require 3 to 5 weeks if a camera/lens breaks and you can't rent a similar one from a camera store, as long as I have to order Godox flashes and triggers from other countries because romanian stores don't have Pentax accessories...
Does Nikon deserve no.1? They can have it.
Does Fuji or Olympus deserve no.1? They can have it.
Do I need the number one manufacturer? I do, but only because as a package it offers me what I need, when I need and not because it's the number one. If I could have a camera without any logo on it, I would be even happier.
Is Pentax doomed? It was, it is and it will always be for some.
But for others Pentax is no.1 and I never had a problem with this.