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bitcoin is very volatile, such high volatility becomes a major barrier for merchants to accept bitcoin as a means of payments.
Imagine that in December 2017, some merchant accepted bitcoin as a means of payment, the merchant would be selling a car for $100,000, if in December 2017 someone had bought this car that costs $100,000, that person would have paid with 5 BTC and if that car salesman Hold the 5 BTCs, how much losses should he have these days?
Current bitcoin price:
1 BTC = $ 3560
5 BTC = $ 17,800
merchants will be afraid of this volatility
Bitcoin has not been legalized in many countries, so it would be difficult to have many merchants accepting bitcoin as a means of payment
On the one hand you are right the price is not stable, but bitcoin can be easily controlled in a regular currency. In General, it is best to take it and keep it when the price of bitcoin is low. You can make a profit out of it.