Granted, I am new here, but let me give you a competitive players perspective from a former online FPS player.
I relate wave-dashing to bunnyhopping in FPS games. Both allow to manipulate movement to a player's advantage by exploiting the game engine. Both techniques however at first, seemed to be fine. In fact, when bunnyhopping (or strafe jumping) was discovered in Quake 1, Id Software thought it was brilliant that people could find a way to manipulate the engine for greater speed/manevuerability.
However, other games based on the Q1 engine (mainly half life) eventually saw bunnyhopping as a technique while valuable, really did not fit into place with the game enviornments (i.e. CS, DoD). Of course there are some games that kept it in (TFC, NS) but the majority of games based off the engine took it out.
The same thing appears to be happening in Smash Bros Brawl. The developers saw wavedashing as a bug, and corrected it. I'm sure a lot of competitive players were upset at first because they spent a lot of time mastering the technique (just as people did with bunnyhopping). But the bottom line is: Wavedashing was a bug, and the developers felt a need to fix it.
I'm sure the competitive players that exist now in Melee will have a leg up on the competititon, especially to new players who have never touched the game. I would not worry about the lack of pro tricks that are being implemented in the new game, as I am sure that there are going to be new ones, and that the general combat skills that were developed in melee, will mostly transfer to brawl.
Granted, I am new, so please take my opinion with a grain of salt. I am just trying to shed an outsider's perspective on the melee to brawl transformation.