the problem is bitcoin price is unistable some time hi and some time low
But this should not be an important limitation. Remember that bitcoin should not be taken only as a currency to be stored in our wallets. We also can use bitcoin as a payment processor to transfer our money with low fees and good efficiency. If you receive your salary in bitcoins and immediately exchange it for fiat money you will not notice any difference in your capital.
Exchange is possible without problems for real money, but only the cost of bitcoin is of particular importance now seen as over one and a half months, the price varies greatly.