To the extent that American keeps the 777-200s over the long-term they may retrofit the interiors of these aircraft. There’s some chance that United’s big order for 100 firm and up to 200 widebody aircraft from Boeing could take delivery slots that leads to American keeping its 777-200s longer. There’s less opportunity for further replacement.
And already American is talking about keeping (at least some of) its Boeing 777-200s over the long term. At the same time, I’d expect some of the fleet to be retired and those aircraft never to be reconfigured.