May be in 2022 the bitcoin community will be widely accepted all throughout the world, as every day newbies are entering the bitcoin community there is a possibility for that and all the merchants, restaurants, hospitals,schools and universities, banks will be accepting this bitcoin and block chain technology and naturally the value of bitcoins will be much much higher, which might even rise above 10000 or 100000 times more than the current value. In such a situation it will be difficult to get one bitcoin in hand when the prices are higher, so now is the right time as there is a slight dip in the crypto market to buy some bitcoins or buy part by part which will also help to earn profits.
They are entering the crypto world not just BTC, so the usage will be divided among those cryptocurrencies, that is also the reason why the price of BTC is down lately. New people are going into alts. But that is a good sign that the industry is going. BTC is having a rough road and this will likely to changed in the next few years.
New people will realize the worth of crypto, banks and governments will use the blockchain, decentralization will be used in different applications. Digital devices and platforms are what drives most of the society and the industry today so the growth rate will be much higher (considering the factors like FUD's and banning of crypto), I think 5 more years is enough for the main usage of cryptos and BTC. 10 years for global adoption.