I think it's safe to say that the premiums will continue to go down as the price rises. Similarly the risks of selling become ever more alarming.
I have a few ungraded coins. There's no way I'm posting them off to ANACS now and the people flogging them on Ebay must have some type of death wish.
The addition of Bitcoin Cash also rather messes with things too.
At some point in the future what will your plans be if you need to liquidate your Casascius coins?
If the premiums keep shrinking, I would think it not matter if you peeled and transferred to a wallet or left it on the coin, since 1
BTC = 1
BTCIn the future, hopefully we do not need to "cash out" our bitcoin, and the world-market marketplace and merchants will be more the ready to accept our korns anywhere...
"BITCOIN - money for the people, by the people"