I'm not much of a Barkley fan, for exactly the sorts of reasons cited above. But I am willing to rationalize being ok if he signs a new contract with Everton. For me, it would be a rationalization, and it would be merely "ok," with no real enthusiasm.
So, anticipating that Barkley continues to play for Everton for the next several seasons, my (rationalized) expectation is that his marvelous physical skills (impressive balance, power, dribbling, the occasional brilliant pass, the occasional brilliant goal) will somewhat outweigh his dismaying limitations. There's reason to expect that his skills won't diminish, and may even grow, in the next few years, and to hope (if not fully predict) he improves in one or more of the areas where he's weak, actually a liability.
Ross wastes so, so much energy running around two steps behind the play (as above, "doesn't know how ... to find the space that has to be filled"). For someone who exhibits intermittent brilliance on the ball, he is perpetually clueless off the ball. I'm always impressed by players (in several sports) who have a special sense/feel for where the ball/play will go next. Most players, I guess, are average in this regard; Ross seems well below average. I don't know - doubt, actually - whether he'll ever improve in this area.
Will he use his power dibbling to get off shots more frequently - actual shots, some of which might go toward the net - and quit his maddening over-clever over-dribbling? We can hope, though so far, as above, "I haven't seen any improvement" in this area.
I hope, usually desperately, to find Barkley in the box more, for headers, Naismith-poaching. Why isn't he more aggressive in overpowering defenders in the box? Why isn't he meaner? He looks stronger than he plays. Not good.
So, I can convince myself that Barkley's wonderful skills will not suddenly disappear, and that there's plenty of opportunity for him to improve in several key areas. If we're to sign him, I have to be optimistic. Right?