Yeah, I think that will depend on the scientific quality of the observations provided by JWST:

- Hubble/COBE level. Refuel it!

- LHC level: Meh, let it rot.

Tbf it is less about the device (and the people working on it) and more about what kind of fundamental changes to our understanding of the universe is provided by its observations. BTW I am pretty bullish on that front.