Quote from the one and only document in this WG:
3.2.1 Scalability
[snip]
A new IPv6 multihoming architecture MUST scale to
accommodate orders of magnitude more multihomed
sites without imposing unreasonable requirements
on the routing system.
As chair, you simply can not recommend to go a way that blatantly
violates the only working document we have. This text is clear, and
it's
a "MUST" not a "must" which has a very specific meaning as per RFC
2119.
To be pedantic, the requirements doc doesn't specify the starting
point: orders of magnitude more multihomed sites than exist today on
the v6 network is still easily achievable using
draft-kurtis-call-me-when-we-get-1000-routes-in-the-dfz-00.