As someone trying to offer a service for BTC, this is my big concern - and why i'm tempted to start accepting litecoin as well. If hoarding is preferable to general use, then far fewer people are willing to spend bitcoin even as more services come up in an effort to provide a true marketplace.
The other side of this is that it fosters buyer's remorse, wherein everything you'll ever buy for bitcoin becomes like the 10k BTC pizza as the value of bitcoin increases. I just printed someone a case for their raspberry pi for ~1 BTC. Will they eventually be upset that they spent a bitcoin on that object? Perhaps - and if so there's no obvious way to assuage that emotion even though there's no ill will involved on my part. Are bitcoins too valuable for spending? If so, then we really need something like bitcoin but without the hoarding which would prevent true commerce.
I'm hoping that a few coin hoarders will prefer to have something custom 3D printed rather than simply buying a pizza, as at least your physical object might provide a conversation piece and an example of the practical use of bitcoin as a means of transaction, instead of simply exploiting the speculative investment aspect. More of a work of art than a simple purchase.
Unless you've got like 0 fiat any remorse is misplaced. Guy with $10k in the bank should not be thinking damn, I wish I hadn't spent 1 BTC on those pizzas, he should be thinking damn, why didn't I buy 20 more BTC.
And if you've got no fiat left then what are you going to do but eat at pizzaforcoins and bitcoinstore? You gunna regret eating and buying a laptop when yours breaks? I don't think so.
