a16z stated in its latest article on quantum attacks that Bitcoin faces two major practical challenges, making its transition to quantum-resistant digital signatures urgent.

First is the issue of governance efficiency; Bitcoin's upgrade process is extremely slow. If the community cannot reach a consensus on solutions, any controversial issue may trigger a destructive hard fork. The second is the issue of migration initiative; the transition of Bitcoin to quantum-resistant signatures cannot be done passively, and holders must actively migrate their assets. This means a large number of dormant coins vulnerable to quantum attacks will lose protection. It is estimated that the number of such quantum-vulnerable and potentially abandoned Bitcoins reaches millions, with a current market value of up to hundreds of billions of dollars.