To answer a question with another - what was wrong with the old livery? was it 'broke'? And when every bean counter in the world rings his/her little hands together and wails about huge losses - does the cost of re-branding an entire fleet figure highly in the grand money making scheme of things?
anyone wanna bet that two or three new logos will float about for a few months, then as bean counters become even more worried the whole thing is quietly 'postponed'...
when all is said and done, there'll be more said than done.