IMO, changing the vocal melodies sucks part of the magic out of the songs. The melodies are that way because they complete the song. Not that alternate melodies are bad, but there's a reason they're sung the way they are in the first place. I would rather they remove any and all songs with James having to go higher for a significant period of time and focus on more modern songs. No song should be removed because they're played too often, because then you're removing an intrinsic element of the band's style, but as far as saving James's voice, yeah, get rid of the old stuff, we don't need to hear Surrounded or Take The Time anymore, or anything that requires him straining, which is a lot of old material. Play more stuff from the last few albums instead. Focus on the now and what will give the singer the most comfort and longevity for the sake of the band.
Sorry if I posted that already, I've typed up a few posts and refrained from posting them here because I don't want to offend any fans of James - I am a massive fan, too, that's why I care about his voice so much.