WB wont reboot their DCeU because it's making them lots of $$$, probably not as much as they want given the current CBM landscape with some of these CBM's doing over 1B WW. If any one of these movies were to bomb though expect some serious thinking by WB on what they might do with that particular franchise.
Depp probably has enough money to retire at this point and still be pretty wealthy. I'm sure he's probably just in the showbiz still to remain relevant and in the spotlight.