I'm pretty sure you can only take one stock for accidentally pausing, and that seems fair, considering that would be the expected result of the infinite anyway. It's not that hard to set up considering the results. Yes, it can be countered, nobody's denying that. The problem arises from the discrepancy between the required skill of the players. If I fail to counter any other character's primary tactic for 7/60 of a second, I take about 50 damage, and that's a very generous estimate. If I fail to counter the IC's primary tactic for about 7/60 of a second, I take, ummm... I'd guess like 200ish damage. Whatever, I lose the stock. Anyway, I think that I'm the only one adamantly against the infinite, and I'm receiving flames for it, and you all probably think I'm a stubborn idiot, so if you want me to drop the argument, just say so, and I'll be glad to, since it's going nowhere.
To counter the infinite: Use quick moves (less than 7 frames of start-up and less than sixish fames of lag [you need some frames to get away if you miss, since shielding won't work]) when Popo and Nana are together. When you finally land an attack on Nana and not Popo, seperate the stunned Nana with mid-level attacks. (like tilts) When they are separated, use your kill moves on Nana. Also, before the tourney, play against a competent IC's. You need to drive shielding out of your muscle memory because shielding will almost always result in a loss of stock when Nana is present.