I think the risk is that if somebody dont own of any and the price explode to the moon, they remain scratching their heads for a long time. Otherwise if they invested a lot and lose everything will be sad, So time will tell.
No i would. I would sell some bitcoin if the price goes very high because I would want to use the profits to pay off debts, etc. However, I don't think I could ever sell all bitcoin because there's really no limit to where it could go. One thing that concerns me is as it gets harder to mine the coins, will the fees go way up to the point that it's not worth having any bitcoin.