Of course...I'm probaly in the minority here, but I'm one that says wrestling actually needs run ins. I mean of course..not all the time or anything, but for instance, last night, the Edge run in, in the World title match. IMO...perfectly acceptable, and because of it, a lot of possibilites have aroused. Edge could join Evo, or he couldn't and it could just start a one on one feud with Michaels, or Edge could join evo..and somehow turn on them saying it was all a plan (yea..that's pretty stupid but just stating examples) but the point is..it's because of many run ins, and WWe's able to continue/start many storylines.
Disabling that..while this may sound stupid, would make this to much of a 'sport'. And well, if you want a good, clean, watchable match with no interference, there's always amateur wrestling :/. But as I said..that's just my opinion. Should they cut down? Yes. Should they get rid of them? No.