If the rumour is that loss making
short haul is axed then I can see it happening. Long haul is a stand alone profitable niche that does not require feed, so they do not need to spend millions replacing the old B737-436s to maintain losing money against easyJet.
I would be a sensible business decision and one a long time coming as I have said before, it's the last painful plaster to be removed after the regions. Just treat staff well in any transition and minimise any redundancies if it comes to it.
T3 at Heathrow? They pulled all their domestic services out of heathrow to move them to LGW a few years back citing costs like landing fees at LHR.
Who did what now? Certainly not BA.