I don't think it's a bad thing that teams who develop the ability to play any tactic reduce the opposition's ability to start with the right defensive tactics to a 50% shot. And that teams that do not do so, do not.
What we perhaps need to think about then, is how fast The Coach can adapt (and how much the GM/owner/player is prepared to trust the coach to do so - while accepting that personnel selection may mean optimal adaption to visible tactics may not happen). It kind of opens up a player 'Intelligence' rating, that could provide a modifier to how players can exploit opposition tactics, but that's another story I suppose.