You are seriously overestimating the amount of skill in the shallow end of the pool. I'm awful at PVP, just awful. And I always have been and probably always will be, since I make little effort to improve. I play smart and am usually helpful, but in straight-up PVP against other players I am slow to react and badly lacking in coordination.
...and I constantly run into players worse than me. Constantly. And no, I'm not underestimating myself. I am bad. They are astoundingly worse.
Anyway, the point is that you'll still be slapping casuals silly from the start to the end of the season. I think that the number of players who will gain enough gear from this change to tip the odds in their favor will be very few. As you note, they made no effort (or very little effort) to get the gear, and it's unlikely that they got any better from the practice. They WILL be more inclined to play, since they believe that those shiny new epics will make them better.
To summarize: all this means is more lambs to the slaughter. Stop worrying, just sharpen your knives and enjoy.