I agree with Catija, and here's why:
In the last 90 days, we have had one migration to EL&U. One.
It's certainly possible that more questions have been flagged for migration and not migrated, but unless we have a flagging problem, it's unlikely to be a significant number of questions.
And as per When should we consider adding a default migration path?:
These paths have a place when two conditions exist:
- There is a clearly-defined topic that is wholly inappropriate on one site and wholly appropriate on another.
- That topic is asked about daily on the former site.
This is pretty rare. Especially if the first site isn't Stack Overflow.
Until then, I'd want to see a veritable deluge of good but blatantly off-topic questions on a site before I'd consider adding a migration path.