Possible and reasonable. I remain less hyped on his potential development than you do but that's hardly shocking at this point.
Can it be October yet plz.
I don't know what more potential development to be had with him is there. His offense is fairly polished at this point, only his hesitance to shoot remains, but that's hardly a hindering factor overall. In the Playoffs, for example, he was shooting well and without hesitation if I recall, in all going full cylinder offensively (which is why he got the start in the 3rd quarter of the 1st game)... but it was the playing tough against good rebounders and strong bigs that prevented him from getting on the floor much after the 1st game.
I just don't envision him improving in that, and that dooms him to a limited role-player off the bench, if anything. He'll have a good season regardless, but it's the playoffs I'm more worried about. Not this particular year, I'm not sweating it, but going forward. If you can get value off him in a trade, do it if worthwhile.