Indeed — there's already a similar card for Attack icons in the playtest mix.
Agreed — I think that four additional icons is probably what it would take to make me blow up a card for it.
Although, also: In playtests at Protospiel this weekend, I routinely saw people blow up more cards than that pushing their turbines for attack icons. One guy destroyed something like 10 cards hunting for seven attack icons he was short for a long-range shot at a fast enemy. So there is a willingness among (some?) players to do some serious self-damage in order to do what they want to do.