Yes when more people starts using it then it becomes more mainstream and vendors shops will start accepting Bitcoin as a payment
You see when prices exploded to $ 1200, it makes millions of people join in bitcoin, the price is very influential
I think also a relatively stable price would be beneficial for a bigger adoption, so no big jumps in the price as we saw in the past months.
Yeah, if the price of bitcoin is more stable then it will attract many people to get into bitcoins, as people are staying away from bitcoins is only because of price volatility, if price is stable people will have more faith in bitcoins and surely start adapting it.
For a retailer, if the price is stable over several weeks, he might hold the bitcoin for some time and pay the supply as well.