oxenos
Not quite sure what you're getting at here. BA didn't seem to quite crack the formula with GO but selling it has been viewed in some quarters as a commercial mistake - GO became a success and then merged into easyJet while they, and the LCC sector in general, have gone from strength to strength since. BA has tried to compete to the detriment of their brand and reputation over the past few years so perhaps establishing an LCC will allow them to focus on the full service market once again.
QF, SQ, JAL, ANA, LH etc have all shown that legacy carriers can accommodate LCC in their group of companies so it could well be argued that BA are coming to the party rather late.