I think Rondo and Stevens are committed. I see Danny reupping Rondo for an amount that will make most fans spit out their coffee, but eventually turn out to be a reasonable amount in hindsight. I don't see any worthwhile trade offers coming for Rondo, and I think he's a creature of habit that has strong bonds within the C's world and will prefer staying put.
Also of note, I barely skimmed this preview and automatically liked it better than the fluffy Bill & Jalen version, which had literally no insight.
"Experts" simply predict whether or not Rondo gets traded, not what he'll look like and add to this particular roster on the court. I personally think Rondo and Avery are still improving and still building out what will be excellent chemistry. I think Rondo, Avery and Jeff have a strong personal bond. I think Sully and Turner have a close bond that will add to the team chemistry as well. There's nothing but high character guys on this squad (with Faverani a potential question mark).
The development will be worth watching, at least for a homer like me.