This has been discussed plenty of times, and while some may agree that lost bitcoin remain lost, almost no one will want 10 or 20 year untouched coins to be "found" by forking a new altcoin. It may happen, but it's not going to be bitcoin. (There was some alt called Bitcoin Unlimited by Jeff Garzik.)
BU has nothing to do with Garzik. It was originally a fork of Core with configurable parameters that would allow it to follow a chain with larger blocks. After the fork which created BCH (caused by Amaury Sachet's fork of Core), they also created a fork that would follow that chain and after a while, discontinued the BTC fork.
Garzik was responsible for the SegWit2X effort/debacle of which I will say no more as I don't feel like getting ranty.