Bitcoin is digital currency and we all know very well that it is different from regular money like dollars or euros because no single government or bank is in charge of it. Means it is totally decentralized. And also people see Bitcoin as good way to save money for long term. Because there is limited number of Bitcoins and its value mostly goes up with passage of time which is protecting it against inflation where regular money loses its buying power.
For now, it's used for speculation and hodling by most, but in the future, I think this paradigm will change toward using BTC for services, even more of them than it is now.
We can all already use BTC in such a way, but it's not as convenient as it should be..