Now, firstly, it is far from certain that BitCoin will ever reach $50,000. I suspect, however, that there will be a book with this title in the next few months.
Interestingly, despite the meteoric rise in price from $1,000 to $20,000 in less than a year, in the same period of time, the number of wallets created on a leading UK based blockchain site has only doubled. Presumably meaning the number of users has not increased that much, but that users are trading more frequently or with larger amounts. So this is a very far away from mainstream adoption.
The practical challenge of the increase in value and the increased number of transactions has been congestion in processing speed. At the moment there are over 200,000 unconfirmed transactions, waiting for their place in the ledger.
On Monday it is expected that Futures trading in BitCoin will start, and that should result in more volatility, but perhaps greater price validation.