The one thing I disagree with you on is the ease of replacement of Frusciante. It didn't work with Arik Marshall and only half worked with Navarro although they didn't really sound like RHCP. I'll eat my words if they replace him easily. The way I see it is that it's like GnR without Slash.
I
like Gn'R without Slash! :lol:
But back to the RHCP, they do seem to have problems getting guitarists to fit the band. As well as Arik Marshall, of course, there were Blackbyrd McKnight and Jesse Tobias, none of whom ever got to record anything (as far as I know). It's not going to be easy.