Bitcoin could protect from inflation but could bring deflation because bitcoin have limited supply.
The limited supply is never an issue. It's only a matter of time before the price becomes expensive enough so that we deal with Satoshi units only, and as you may know already, there is no shortage of Satoshi's.
In the end, it all comes down to the price; if the price is high, you can buy more with x amount of coins, while if the price is low, you need to add coins in order to buy the same goods you bought when the price was high. Pretty similar to fiat actually.
Inflation should controlled by money supply but i think we should back to gold standart
Bitcoin standard is better.