If I recall, at one point in time, SNACs were nerfed to a pitiful, what, 800m-1000m? That alone made bombers nearly worthless against larger capital ships if you had no Novas, and instantly worthless to battleships/battlecruisers toting flaks.
Novas are inaccurate enough. Why make them dumbfire weapons? You'd have to up their projectile speed immensely in order to make them useful, and even then, thanks to server lag, dumbfires are extremely hard to use if they still act like torpedos and retain their explosion radius. The point of a Nova Torpedo is to be able to blow someone's equipment off, so making them act like Hellfire Rocket Pods wouldn't seem like an option either.
Honestly, keep Novas/SNACs as-is. If you're getting solo'ed by a single bomber while flying a capital ship, you need to either A: Practice dodging if you prefer to solo play, or B: Group with snubs/gunboats who will eat the bombers for you. Flying with friends is more fun anyways, and when others see a number of people in a system, odds are, they're going to fly there for potential RP or PvP.