I think everyone knows bitcoin is in bubble mode right now, 12B in market cap isn't justified by the amount of transactions that occur, alot of the money in BTC is speculation. The amazing thing about BTC though is that it still has the potential to rise significantly. I could see 10k a coin.
I couldn't care less if a BTC is ever used in a point of sale transaction. There are many investors like myself who only see it as a store of value to be cashed in/out at exchanges.
Just to add to this, this doesn't necessarily mean "cashing out" to profit. Store of value isn't about day trading. It's just a store. It stays there until it's needed.