I'd say so, but everyone has their own motivations. First, the Colts don't have an opening, yet. Second, the Colts don't have an empty front office, yet. So if the Niners offered him input into the GM hire, along with some personnel control, Jeff Fisher style, that makes that job attractive.
If Irsay got rid of Pagano and Grigson -- who McDaniels might have some beef with over Deflategate, though I doubt it -- and offered McDaniels the same deal, I think the Colts would be more attractive because of Luck. But that's just my opinion.