This is the Hulks rights and Xmen rights argument all over again.
If Universal owns the rights to Dracula flat out and not to just there own specific version of Dracula. Then provide some evidence of this. It shouldn't be any different then Thor. As long as they don't cross a line that resembles Marvels Thor too closely, anyone can do whatever they want with Thor. Blade 3 Dracula/Drake was nothing like Universals version. Therefore there should be nothing they can do about it. I mean hotel transylvania Dracula outside of the family bend is pretty close to the traditional Universal version. Alot of its played for jokes but its there. If Universal could sue for Copyright infringement they would. Not doing so is leaving free money on the table. So I doubt they can, movie studios don't just let other studios use there intellectual property for nothing.