This is true, but if Ollie and Canary could go through that whole mess with Canary's daughter, Grayson and Karen and Helena can get through a little awkwardness.
I'd be down for Power Woman. Hell yeah. And I wouldn't say never with Karen taking the name upgrade either. She's not such a big property that she has to be frozen for marketing and advertising purposes, and that solves the problem with Tanya's name. And DC loves their legacy characters (as canon fodder if nothing else).
Its unlikely, but not impossible. I dont see anyone at DC caring enough to fight against it, honestly.