The word "regulation" is a problem. Regulation is why Greece's citizens have pension funds stolen from them by Goldman Sachs, via the IMF. Anything to do with government and banks is corrupt.
The issue with regulation is that as soon as Central Banks regulate BTC, it gives it legitimacy. Central Banks are not sure whether they really want it to be legitimate tender.
So with everyone climbing into BTC and just holding for price appreciation, when am I going to be able to use it for day-to-day purchases without it being a huge pain/cost? Why doesn't WW or my landlord want my BTC?