Unless you had no alternative, or ACTUALLY WANTED SOMETHING. Gee, I'll just live in a cardboard box hoarding my bitcoins since tomorrow they might be worth more. I guess I won't eat today anything more than cat food and out of a dumpster since I have to eat something, but the I'll save the rest for the magical day that I actually want to spend my bitcoins.
My point exactly on actually wanting something.
But let's say you have bitcoins or dollars. Bitcoins are strong and dollars are weak. Why buy your food with bitcoins? Much better to dump your dollars, until you run out.
Ok, let's say you have bitcoins OR dollars
how would you decide to keep bitcoins and better dump dollars then?
you could also keep your dollars and better NOT get that new computer today, you will get that same computer much cheaper next year,
but that's not what you do, because you want/need that computer now and not in a year.
point is, you can only hoard money, if you don't need to spend it.
I wish someone would start a new blockchain just to test this. We'll see if anyone uses it.
there are some alternative blockchains already for different purposes,
some used as game-currencies (i heard of MartianBotCoins, whatever that is), some as domain-currencies (namecoin), some as test-currencies,
feel free to create anotherone.