'Sheeds overall career numbers are not great enough to offset the negative perception he's developed in his career, both in Portland and at the end of his Detroit tenure. It's also not like he was ever the clear-cut best player on any of those Detroit squads; he was the piece they needed for the title, but I don't see his overall contributions as being more important that those of Chauncey or Rip or (at least for the title season) even of Big Ben. He was a great member of that team, but at least for me, the HOF is for guys that had a singular greatness - players that were just absolutely dominant, at least for a while. 'Sheed has been a great player, but never a guy who took it to the absolute highest level. You never thought of him as an MVP type.
Even with a couple titles in Boston, I don't think that's enough. He'll be remembered as a very good player who likely could have been a bit better.
The perception that he quit on Detroit - true or not, justified or not - isn't going to help either.