That would mean that instead of the data being in a single centralized location it's on every single node. That's the opposite of what we need.
Edit: Assuming the colloquial use of the term "blockchain", a public database. In the sense that a blockchain is simply a data structure it's not necessarily a problem but also not a solution.
Edit: Assuming the colloquial use of the term "blockchain", a public database. In the sense that a blockchain is simply a data structure it's not necessarily a problem but also not a solution.