The figure is actually 49 "volunteered" to leave the 777 fold. Half of them are FOs who think you "have to be in it to win it".
Apparently a lot of capts changed their mind after discovering you need to be current on 777 if you want a job on it elsewhere which many people do seem to want.
PS: if you believe anything those embittered slags from HR have to say at a management meeting then let me introduce you to Ahmed, my cockney english finance friend at Devere and Co, he has some great funds to sell you.