That's fair enough and I can understand your viewpoint - it was merely meant as an observation, and wondering whether it would get evicted from OU.But such is not a competitive observation. Regardless, I don't like speculation of this sort. It equates to "What if we took a pokemon's very big weakness--that also being its only weakness--and made it so that it was immune to this weakness (or better, with Sap Sipper) completely?" The same thing could be done with Scizor, Forretress, and other pokemon I'm sure that I don't care to think about.
Also, I don't think a NP set would work, although replacing Taunt with Sub might be more effective. Its Seismic Toss will break the Sub, but it gaurantess a "free" turn if its used on a Wish/Protect/status or a switch in. It would probably kill itself from rocks damage and Subbing, but eh.