It would have been not so settled economy because of one most important character of the bitcoin, decentralisation.

I mean this is the thing which is keeping bitcoin ATH by attracting more investors into it and they can operate it the way they want. Billionaires are manipulating the market and even on top of this we saw how china behaved in early days. So I believe that it could have been very very unstable market to be used as currency in the real time. Lots of conflict in the trisection could have been their which we see it today also even though it is being used as investment asset only. If it would have currency then it could have never tolerated the instability and thus everything could have been little messy in terms of economic conditions, all the ups and down.