so is this just a bubble all over again or there's some solid reason bitcoin should grow in value?
It all depends on the amount of wealth that needs to be stored in btc. The more wealth in a scarce commodity, the higher each unit becomes valued. If it becomes the new 'gold' in terms of storing wealth, it will shoot up accordingly. If it does one better and becomes even a moderately frequently relied-upon currency as well as a store of wealth, then it should have a justifiably higher price than today.