Much more a store of value in theory and a highly speculative asset in practice right now i guess. As transaction methods lighter currencies as lumen or even litecoin are more practical.

It can be something in the range between 25.000 and 40.000, unless of course some new currency skyrockets to be the next big thing. Maybe some fee-less, fast, energy saver currency, but at this regime such a market cap is probable to occour soon as many as it's probable for the situation to stay the same.

I think we accustom ourself too quick about new prices ranges, bitcoin proved it can be very volatile, It still can be an option.