The only reason a cabin refit might be possible (in my mind) is that seeing as BYO and CPT are now no more than a pile of mixed metals, they will have had their relatively fresh interiors with the newer seats ripped out, so maybe CBK and EHH may be able to be fitted with them, lord knows there's enough down time at the moment for them both to get a refit.
There's no rumours of new aircraft on the horizon, so I imagine that the current set-up is here to stay for a while.