There's nothing to say they couldn't do this, but it has been suggested that they probably won't. By themselves, the 466s aren't DDA compliant. The only place they have regular usage is to strengthen additional services (which would be DDA compliant on journeys longer than 60 minutes), used by themselves on the Bromley North popper (a total journey time of about 5 minutes) or the Sheerness line (less than 20 minutes).
The 466s may now well have a limited future with Southeastern - I would expect the networkers to be replaced with something more suited to Metro workings come the next franchise. Personally, I think they're reasonable units - I'd certainly take them over a pacer any day of the week, but given they're probably beyond conversion to AC, will likely not find a new home.