It's hard to argue that something that could be worth +/- 10%+ in the time it takes a transaction to process is a good "store of value", too.
I certainly don’t think of any of it as a store-of-value ... more like a trip to the casino!
I for one know a few folks who have used bitcoin to transfer large sums of money across borders... pretty crazy times we live in. I expect bitcoin to dominate in this area in the short to medium term.