Highly doubt this for a few reasons. First off, Slurpuff is not that hard to prepare for, between the 3 of you you named of half-a-dozen counters to the BD set from the top of your head. The second main reason, is it just isn't broken. It's versatility doesn't push it over the edge unlike other pokemon (like Mega-Luc / Zoroark) it just makes it a very good mon. Half the time you can extrapolate whether the opponent would be running physical/special from the structure of their team, and even if you can't, there are still sound switch-ins to both sets (Probo, Bibarel, Muk). It may be a really good mon, and hell it might even be suspected eventually, but I don't think it needs it tbh. :)
Also
SoulRed12, grats on
666 posts :^)