If Bitcoin gets workers around the world, we will be more difficult to invest. Perhaps at that time BTC only used to purchase goods and services, BTC will return to its original purpose. At this time, the market will produce more hackers who rob someone else's wallet, people may be abandoning the BTC because they are very risky. That's my guess.
I think that is not right that it will have problems because if bitcoin will be legalized all over the world then at that time every person will work for bitcoin and the price will increase too much because when more people will accept it then the price of it will increase too much. So in this way there will be more people working for bitcoin so it will be a more secure currency then.