Higher adoption will lead to higher price in future, but we also want that big businesses and companies should start investing in bitcoin and that will take price to high level drastically.
Great increase in the numbers of adoption will result for a high price only if those numbers will use bitcoin as mostly in investment.
If there will be more companies accepts bitcoin payment and people will regularly use their bitcoins, the bitcoin price will become a stable one. This is bitcoin as currency and no more high price increase range will happen.