VC is kind of unnecessary when matches don't last longer than 5 minutes, then the teams just get shuffled afterwards. Splatoon is so fast paced you wouldn't be able to hang back start plotting for an assault, and the objectives in each match are so simple that the most you could do is try to alert others where enemies are, which someone can already do themselves if they're looking at how territory is shifting on the Game Pad.
If you need way more speaking options than the DPad commands chances are you're trying to make Splatoon into something it's not, or are just wasting time.
Also please remember they intentionally left VC out because of all the negative things it does to a game, anyone who plays a FPS with VC knows how much trash talking happens compared to the amount of legitimate strategizing. Plus kids will be playing this game, they don't need to get cussed out by angry adults, or other kids really.
Lastly if you're playing with friends, Skype is right there.
Anyway splatoon will be fine, the question is who's waiting until august to buy it.