No, this doesn't make any sense. Multisig outputs are a tool you use to build helpful features, not a feature in and of themselves.

By all means create a nice protocol, implementation and BIP for something like:

- Creation of multi-user money pools for managing an organisations funds

- Dispute mediated transactions

- Watchdog services that provide a third party risk analysis of transactions

- Micropayment channels (actually me and Matt already did this, sans BIP)

but trying to do just "multisig" won't work well.