You wont receive as many recruiting emails. I only recruited via linkedin for a while because the way I saw it is that anyone with an account is at least passively interested in hearing from me. If someone didn't have a linkedin I didn't take the time to track them down.

That being said many (including myself) recruiters now use other sites to find developers. But it's definitely less than the amount who just search linkedin. It doesn't seem like you were getting very good emails from recruiters to begin with so it may not be an issue for you to get rid of your account.