Still want Bruce Campbell for the role of Sully but Cranston is one of best at what he does and would pull off that role with no prob.
I always wanted Jeffrey Donovan to play Drake as he and Bruce Campbell worked great together in Burn Notice but don't think he could pull of the humor aspect of Drake, too serious in most roles. Chris Pratt would nail this role though.
Tom Holland as young Drake would be perfect but I really don't want a movie to focus on that much at all.
Biggest issue like most people are saying is the director for sure, not really sure he is fit for this type of movie. Perfect game to adapt to a movie, with the right director.