Going mainstream isn't a problem in itself. The problem is that most "mainstream" usages of bitcoin are just using it as a way to get fiat money. For example, t

Going mainstream isn't a problem in itself. The problem is that most "mainstream" usages of bitcoin are just using it as a way to get fiat money. For example, the price is currently shooting up because people think it's going to give them a lot of fiat money when they sell it later. If everyone used bitcoin to directly buy and sell things, it would be fine for it to be mainstream. The transaction fees would also be much lower, because there wouldn't be the fee to convert it to fiat money.