so it is the same as a few years ago when they phased out the 767. at this time some of the guys where nervous to loose their job and offered to pay for their 777 rating. VNA took the offer and everyone had to pay from this day on - on any fleet. there are plans to convert the 4 remaining 777's to freighters. the good ones with the GE 94's are going back to the lessors, only the crap ones (owned by VNA) with PW 4090 engines are going to stay, they are not near as efficient as the GE-powerd ones. originally they were PW 4084 and later upgraded to PW 4090
as there is some financial pressure on VNA at the moment (viet-jet is taking a lot of their domestic and international business - even offering flights to korea now) VNA is happy for every cent they can get. they will sell seats in the 787 and 350 cockpits for $$$. for sure they will have enough applicants as both types are new and quite attractive to have in the license. after your bond is expired the world is open to you - so why not to invest in your future.