Not really sure yet. He does some things really well and is still young. I remember when everyone was upset that Memphis gave Pau to lakers, and now would take Marc any day. Not comparing the two, but given the opportunity and playing time, who knows
Yeah, he is still improving and it's hard to say that he won't be a longer-term starter in the league. Even a marginal starter can play on a championship if his teammates are good enough. So far, there's no sign of any top-10 to -15 players within the C"s reach, however. If Danny sells all that it looks like he might be selling this season, there's at least a hope of a higher-ceiling center prospect from the draft. Also, I see KO as a long-term starter on here on the C's, and he might need more of a beefy and/or shot-blocking big up front with him than Tyler really is.
As to the poll, it doesn't actually make any sense to make a decision on Zeller like that in isolation. There are bigger pieces and questions in play, and what the C's eventually do with him will be more a byproduct of other, bigger factors.