I don't think the production will do what I'm about to describe unless it's temporary, but I'm imagine Davros "regenerating", regrowing his lost limbs and organs, no longer needing "the chair". But I also imagine that would probably wedge a divide between the Daleks and him. The Daleks would lose what little sense of "kinship" they have with Davros as he would no longer need the hardware to sustain him, the technology he adapted to sustain his mutated progeny. Davros, in turn, no longer scarred, wracked with pain and dependent upon technology to keep him barely alive might lose that maddening drive to prove himself and lash out from self loathing. He might no longer see the Daleks as his "children" and actually find them repugnant.
But you just know the showrunners would not allow such a drastic change to remain. Something would happen to put Darvos back in the chair. He's injured again; maybe the Artron energy wears off, possibly a time bubble or the temporal vortex reverses the effects, whatever. He's too iconic a character to be left "rejuvenated". But even if a short term situation, an intriguing story could be developed around the notion.