Brawl? The smash game that the majority of competitive smash players hate? And over guilty gear?
You would be cutting out all anime players entirely for a game that isn't gonna bring in anymore entrants that the other two smash games aren't already. EVO would lose entrants and viewers with that idea.
EVO's games choices are centered around what gets players to attend and what gets views on stream. And they try to hit up all the different fighters demographic. Anime players, NRS players, smash players, Capcom players... If they only cared about selecting the best games then Virtua fighter and third strike would be a lock every year.