This could be done via blockchain-based smart-contracts. Self-executing contracts could trigger a mass migration of user accounts to another SaaS provider if some set of conditions are met, like for the example, the number of accounts party to the smart contract reaches a predefined threshold.
The purpose of this smart contract could be even more general purpose than that, in being structured as a Decentralized Autonomous Organization (DAO), with accounts voting to decide what the accounts will collectively do.
The purpose of this smart contract could be even more general purpose than that, in being structured as a Decentralized Autonomous Organization (DAO), with accounts voting to decide what the accounts will collectively do.