BTC is going up because people want to earn $$$.

Which is exactly what is preventing BTC from being adapted for it's original purpose.

Who is going to accept a currency in their shop, which can go down/up with 15% on any giving day.

Shop owners do not want to mess with that. They just want to keep their business running.

Needing to worry about the BTC market price would be a con for them rather then a pro.