people are adopting bitcoin all the time ... i've adopted it at least 4 or 5 times already.
First you start off by adopting a few percent of your net worth into bitcoin, then you adopt a little more maybe up to 10-15% then before you know it you adopt at the 30-50% and when you realise how absolutely corrupt and broken the fiat socialists ponzi scheme tax-prison farm really is then you go wtf and go all-in 100% adopt bitcoin.
ergo "adoption" is a meaningless non-quantifiable term useless for any sensible analysis.
Right now there is a group of people (ranging between 2-40 million in number) who are willing to hold ~$5 billion worth of value in bitcoin is as much as you can say with confidence. If those same people decided to double their btc hodlings would the be same effect if the numbers of people 'adopting' bitcoin doubled.