If I don’t waterproof my foundation now, should I be worried about fixing it later?

The longer you wait to fix your basement, the more damage you will have to contend with. The damage could be a result of unhealthy mold, reduced value of your home, structural problems, electrical and shock hazards. Infestation of insects, for example carpenter ants. Your best course of action would be to fix your basement now before it gets worse.