It was never a consideration, because they were never part of the band. Genesis always made a distinction between the band proper and the "touring band". Chester Thompson (and Bill Bruford before him) was only ever the touring drummer because they wanted Phil to front the band, but needed someone on the kit full time. Daryl Stuermer was only ever the touring guitarist/bassist because they needed someone when Steve Hackett left.
I know what you're saying, and to some it may seem a reasonable compromise, but I've never had any problem with Mike Rutherford's chops. He's not the flashiest guitarist, but he's fine for what they were doing from the late 70's and beyond. There was no reason to invite Daryl because they already had a perfectly fine guitarist/bassist.
Chester is another matter. I read that he was disappointed that he was apparently never considered to replace Phil on the kit when Phil left. It's possible that Mike and Tony had a bit of tunnel vision regarding Chester, thinking of him as "only" the touring drummer, and not even considering him a candidate as full-time drummer in the band. After working with him in that capacity for 20 years or so, I can see that. Phil was originally "only" the drummer, and it was only after countless failed auditions (some say over 100) that it finally occurred to them that they had the new lead singer already in the band.
Mike and Tony had been in Genesis from the beginning. After successfully carrying on after Peter Gabriel left, and later Steve Hackett, I think they were in a mindset that you don't replace members, you just learn to continue without them, and that worked well for 20 years. Losing Phil after all that time I think messed with them. They had to find another singer and another drummer. One person who could do both would've been great, but when that didn't pan out, I think they panicked, and when you're in panic mode, you're not thinking clearly. They considered ending Genesis, but eventually decided to carry on, try to make it work. In hindsight, maybe they should've called the new band something else. But with Mike and Tony in the band, many would've just called it the "new Genesis" anyway, and my guess is that helped them decide to continue as Genesis. I mean, if everyone was going to call them the "new Genesis", they might as well do it, too.