In a vacuum, if Chelsea were a different club, I wouldn't have any concerns about going for someone like Maresca. Slightly outside of the box but if they feel his ideas fits with the squad and his personality fits with the club, then cool, we move. The problem here isn't Maresca and whether he's good enough to get Chelsea competing at the top. It's whether Chelsea have the bollocks to persevere through the growing pains.
They keep saying they want a manager who can buy into a long term project but if they don't then show the required patience for a long term project, then it's nothing but empty talk and then they might as well go after the tried and tested experienced managers, put half the current squad on the transfer list and bring in 10 experienced players who have won elsewhere. Otherwise, back the manager they've chosen, stick by him if he struggles and let's see where we are 18-24 months from now.