So much to unpack there.
Her name isn't Rose Tyler, it's Rose whatever Donna's surname now is!
They haven't remotely announced who will take over after RTD. He's taking over for the 60th anniversary and 'series beyond', that's all we know. Is he likely to stick around forever, probably not, is he likely to stick around as long as he did the first time, which wasn't really that long in the grand scheme of things, who knows?
Her name isn't Rose Tyler, it's Rose whatever Donna's surname now is!
They haven't remotely announced who will take over after RTD. He's taking over for the 60th anniversary and 'series beyond', that's all we know. Is he likely to stick around forever, probably not, is he likely to stick around as long as he did the first time, which wasn't really that long in the grand scheme of things, who knows?