Many people have locked in funds in retirement accounts that can’t directly hold bitcoin in cold storage; therefore the choice is taking counterparty risk with an eft or microstrategy. 

Also, companies will still exist on a bitcoin standard and the stock market in the future may settle in bitcoin 🤷‍♀️ The correct question is who will be the largest company in the future. I think Microstrategy. 

*not financial advice