Notwithstanding Stein's report that INDY wants Dragic (who doesn't?), I really doubt he is going anywhere. He is under contract for two more years and he was truly dynamic for that surprise Suns team last year.
Bledsoe, on the other hand, is a restricted free agent. I would think a straight up swap of Lance for Bledsoe might make sense for both teams - no need for BOS to get involved.
If Indy wants to parlay Bledsoe to BOS for Rondo, I would want a little more. Can IND trade next year's pick? Bledsoe, Mahinimi, and next year's 1st for Rondo? I'd think about it. Could be the best offer out there for Rondo.
Imagine the defensive havoc a three guard rotation of Smart/Bradley/Bledsoe could wreak? Of course, offensively the Celtics would continue to have spacing issues. There I go - just talked myself out of it.