I don't think Babcock is getting fired (not by a long shot), but I do think Dubas is starting to flex his preferences a bit more now that most of the season has played out and they have some more evidence of what works and doesn't work in the league these days. He needs only point to Tampa Bay's 4 lines deep of committed speed and skill, regardless of size.
Honestly, I think the Leafs are on track to grow into the better team within a year or two. The Lightning are more seasoned with deeper playoff losses at the moment.