Main thing that would wear the suspension is hitting square edges like potholes. Suspesion components are designed to take constant up/down, but what they wont like so much is sudden up/down. Wouldnt worry about it, bushes will likely be shot befre the suspension, and then its a good excuse to get some new coilovers
From what I've seen, bushes are past their best by about 50k miles, suspension will last, what, 100k miles if not battered and looked after even longer.