Look at this thread. People are talking about wavedashing again. That's how creative we are I guess. It only takes a few pages before we get back to wavedashing. It's not going to happen. Give it up.
I suggested a reverse dash-cancel at one point, where pressing down and back during a dash caused a dash cancel with reversed momentum. It would be less broken than wavedashing, but would allow for some of the spacing strategies that wavedashing created in Melee. It was shot down because some people thought it would homogenize the gameplay. Crawling characters can dash cancel into a backwards crawl, which has similar uses.
Never mind the counterargument that those characters wouldn't be able to dc into a crawl without Brawl+, so it's technically an arbitrary advantage they've been given.
The point is if rdc is not going to get in, full-blown wavedashing certainly won't.