There is NO way in which BTC could skyrocket in use/popularity/adoption and not see a massive price rise. If we went to hundreds of millions of users or billions of users (or trillions in the case of IoT), there would be a massive spike in the price (10,000+% up from here would be extremely doable). The value of the network is tied to its use - price will track around whatever that value is. There is a question of what sort of networking power law BTC would track once it matures, but, I'm pretty confident it will scale in a pretty explosive way (if they get the scaling right).