Bull run could start before massive adoption, just like happened in 2017. And without bull run we can't talk about an adoption. Look how many people used cryptocurrencies in 2017 and how many in 2018.
Would it be much more better to hear, that the result of bitcoin adoption is bull run? But sadly, it is a fact that before, the reason why allot of people engage into crypto is because of the huge market value. But let's dive deeper into the question why? The answer is still Adoption, adoption of big projects such as ICO's that utilizes Bitcoin as their payment method to but altcoins which triggers the bullish trend of bitcoin.
I think that it is uncalled for to actually link the development of bitcoin to all these altcoins because if you look at the number of projects that has been released in the past, so many of them actually had pair with bitcoin? Most of them are on ethereum blockchain while some of them are on their own personal blockchain.
When it even comes to payment for the funding of the project from crowd, most of these projects do request for ethereum which the investors changes their fiat to ethereum and the fiat never even passed through bitcoin for us to have said it was because of altcoin that bitcoin had that significant growth then. Bitcoin has always won the trust of the investors on its own without the assistance of the altcoins, but rather, it is altcoins that has been relying on the increase of bitcoin for them to rise.
If we can get more adoption of bitcoin, then the market will surely be on the lane of bull run again.