Why the price of Bitcoin is still down?
Because there is no real adoption yet.
what do called to stores and established that are accepting bitcoin already, isn't it called as an adoption already.
maybe the proper way to said it is that the adoption is still slow but you can always consider that bitcoin is quite new, and eventually it will grow.
What you are seeing about the using of bitcoin to make option for fiat is just temporary. Adoption is going to happen through getting it down in the book and the government endorse it as documented, then fear of using it will go out from majority of the nation who are banning it.
Here's some proof that the government already supporting it, and that is by regulating exchanges which we cash in and cash out our money.
Maybe other platforms will be followed soon but you can't expect they'll be able to regulating everything instantly.