About this blockchain

I have used Bitcoin since 2014. But I do not believe in this block chain business at all.

Block chain is about sharing a database between the users. As in 'a database'. The Bitcoin database already has shown to be too aggressive and expensive for the masses. Latest Bitcoin apps do not use it (collect it to local disk).

Where are we going to store all these "block chains"? The idea is that a block chain is a shared database, but what if we can not afford it?