I do think that sleep mechanics are a problem and I do think that Breloom is a problem because of spore. However, even though I am quite alright with banning abilities, I think that banning a move would cross a line that some in the community claim to have drawn. The reason Smogon is able to gain the necessary support to ban abilities (during the suspect process) is because there is a promise to the people who worry about a slippery slope that we won't ban individual moves (this is my theory at least). I think that changing present sleep mechanics is an unsettling proposition because deviating so far from cartridge mechanics undermines the legitimacy of the site, but I'd rather do that than ban Spore. I think the best solution is to suspect test Breloom, because I don't think Spore is broken on Amoongus or Smeargle, and I don't think Hypnosis or Sleep Powder are broken on their respective users (Gengar, Politoed, Ninetales, Venusaur, Roserade).