Honestly, the ridiculous standards that some Wings fans hold up for number retirement these days, we'd better un-retire Lindsay, Delvecchio and Abel, because they don't qualify. Hell, even Yzerman, he's not all-NHL all-time quality, so he doesn't count either. Just Sawchuk, Howe and Lidstrom it is.
IMO, Datsyuk is a yes. 4 more seasons and he will be ~1050 points, more than Ullman, Lindsay, Fedorov, Abel etc and good for 5th all time in Wings scoring (only Howe, Yzerman, Lidstrom and Delvecchio will have more)....throw in (at least) 3 Selkes, 4 Lady Byngs, 2 Stanley Cups and an incredible human-highlight-reel style of play and I don't see how you can say no.
Zetterberg is going to be borderline. A lot depends on how his health holds up, and what he achieves in the 2nd half of his career. He could easily accumulate 1000+ points, but he might need a bit more silverware.
Fedorov, by any measure should be straight up there.............except for the manner of his departure. That was one reason why I hoped he would come back late in his career, so he could have a rapproachment with the fans/management. Hopefully he'll appear in one of the legends games at the WC to begin his rehabilitation.