We need more users, especially major players in the game.
The fact we know is that there are more millionaries in the world than the number of Bitcoins in existence. Now imagine if at least one-third of these investors decided to buy 1 Bitcoin...
Adoption has stalled - the number of transactions per 24 hours has been about 250,000 for over a year. Though segwit has been enabled, people arn't using it, and fees are still a problem.
I honestly think that if bitcoin doesn't resolve it's problems by the end of this year, a flippening will happen and another coin will take the crown.
This is a good point. Currently the price is inflated because of investors, this means it's a bubble. Unless the adoption starts to rise, sooner or later investor will decide the bull run is over and start dumping bit coin. The price could drop massively.
While bitcoin as an investment tool/store of value itself creates demand, I think transaction volume from real world uses is essential if it's to take off as a currency. Until that happens we're in a bubble IMO, all that's needed is for the holders to decide it's time to sell and the price can go very low.