Will probably change their patterns, but usually a "trail" is a good thing to have. You dont say how big this trai is, or was it cut in with a dozer? Just a hand cut access trail? Deer use human made trails for the same reason we do. Its easy to get around. Might help your stand access too. Typically there is no downfall to a trail provided it is not the width of a hiway nor sees a lot of traffic (motor or foot). If it was cut in go out and throw some clover seed on it while its still dirt.