The long-long-long awaited sequel is a dicey enough proposition; remember “Independence Day: Resurgence”? “Blues Brothers 2000”? “Zoolander 2”? (Judging by the grosses, probably not.) But it’s particularly sticky when it comes to Bill and Ted, whose inaugural efforts – 1989’s “Bill & Ted’s Excellent Adventure” and 1991’s “Bill & Ted’s Bogus Journey” – were so decidedly of their moments, rooted in the metal-dude doofery of the end of the ‘80s. and powered by a seemingly irreplicable worldview, silly but not the least bit cynical. You can see the difficulty here, as few things on this earth as inherently cynical as a delayed-by-decades movie sequel.