Maybe he's decided he now likes it, but I think ultimately it was his latest way of extending the Genesis Revisited theme. I don't blame him, I'm sure he's done well out of it and why not. Maybe he will do a Nursery Cryme 50th tour in 2021.
I thought it was a good idea as well - I liked that tour, the ones before it, the one following it, and I would continue seeing any Genesis-themed tours he chose to put on.
I think his bone of contention at the time is that he preferred a couple of tracks (Inside and Out, and a Genesis version of "Please Don't Touch") versus tracks that made it onto the album, like" Wot Gorilla". I wouldn't have minded if those songs had made the album instead; it's still my favorite album as it was originally released.
Also, I don't think he can properly be begrudged for doing all the tours either. The other three haven't toured with the Genesis catalogue since 2007, he liked the songs he played on, he felt like playing them live again, so he did so - what exactly is the problem? Every time I have seen him on these tours, the reception has been rapturous, virtually every show sells out, and the band and he are clearly having a great time every show. Why would he stop? I, for one, hope he doesn't - the eras of Genesis he played in are my very favorite of the band, and those songs haven't been played live en masse and in full since the late-70s (early 80s for certain tracks).
These tours filled a want and need that many Genesis fans had, i.e., live Genesis consisting of the songs from 1971-1977 with the added bonus of the actual guitarist from the band at the time. The Musical Box (and others) do a great version of keeping the Gabriel-era Genesis music alive (since the days of a potential full 5-man reunion are long past); there are many cover bands that I have seen, both in the US and the UK, who do a great job of doing career-spanning shows; I wish the other three could get together and play Genesis music again (maybe it will happen again - who knows?; if so, I'd be the first in line for tickets - I think there should be more tribute bands for the 3-man group's music as well); however, since the 4-man era is my personal favorite, I hope Steve goes as long as he chooses with these "Genesis Revisited" shows. I'll go every time. I know very many feel exactly the same way.