To a point, I agree. You're far more likely to end up with a bust if you choose for position rather than ability. As far as trading down goes, that just doesn't happen all that often.
At the end of the day, the draft is a crapshoot and just one facet of how a team is built. Whether or not the BILLS pick a lineman in round one of this draft won't make or break either the team or the draft.