There are numbers of factors related to this bubble I reckon,
1. The advancement of technology and digitalisation of everything
2. Japan accepting bitcoin.
3. The momentum of all of this.
I hope the bubble doesn't burst soon and we crypto users lose all our money, but I definitely think it will burst in the next 5-10 years.
The value of Bitcoin will increase more, but not fast as now. One currency can't increase always, need time for down and wait good time for increase again. This bubble Bitcoin and Cryptocurrencies will breakdown, but I can't know when