recent confirmed sale of all remaining 757s we are likely to be fully crewed, if not overcrewed for quite some time to come
I don't think BA are 'overcrewed' in the slightest looking at monthly CAP figures.
Even taking in to account the drop in pax.
Also, the 757's have always been 'earmarked' for Robin Glovers little escapade over in CDG and AMS, the sale to freighter conversion just nets BA a bit of cash. The plan has always been to replace them with the new A320's seen around and those that have come back from GB. Hence the requirement to fill in a forced bid last year.
Things are static at the moment I'll grant you but I don't think it is going to remain static for too long with the fully financed aircraft orders BA has planned plus the possibility of early (already funded) A380's that neither AF or Qantas can afford. Add to that the 777 orders that start arriving next month plus the 777-300er and I think you will see how quick things turn around.