I think that to go back 15 years would probably be a good thing just to get away from all the hype of deer hunting today. We could read real stories in magazines instead of articles about how to hunt giant white tails in Iowa. There wouldn't be as much competation for hunting land and hunters would treat each other with respect instead of puting up stands to try to cut off the deer before they get to the first guy. It was a little simpler time when people had fun and enjoyed hunting and didn't feel driven or obcessed with killing a Booner.
As for the equipment that wouldn't bother me at all. I make almost all of my own including bows, arrows, quivers, stands, and blinds. It might be a little uncomfortable to give up the gortex boots however. We certainly don't need most of the newest and latest equipment to kill deer, but the marketing industry has convinced us we do. There were lots of deer taken without 300fps bows, carbon arrows, mechanical broadheads, and 85% let offs.
As for the knowledge part, I don't know how that would effect me either. I pretty much hunt the same field edges, trails, and creek crossings now that I did then. I think that anyone who spends some time in the woods understands where the deer move, feed, and bed. Most of the other knowledge, while interesting, is secondary and not very necessary to harvest a deer.
I might ask you to expand this question a little and think about what things will be like 15 years in the future. Will our children and grandchildren be able to enjoy a beautiful day in the woods hunting white tails, or will they be totally consumed with killing a 200+ class deer and disapointed when they fail. I don't like to hear things like I had to settle for just a doe at the last minute, or all I could get was a small buck because the big boy wouldn't come in. If we can't give these animals the same respect as the bigger bucks then maybe we shouldn't kill them. We are deer hunters, not antler hunters and every deer should be respected for the wonderful gift that it is.