There are three future perfect continuous points in the EGP that are all very rare.

Point 54 is defined as

LOOKING BACK FROM A POINT IN THE FUTURE and to emphasise the duration of an activity or event.

Point 49 is AFFIRMATIVE with ‘will’.

Point 42 is NEGATIVE

Actually we have already covered the negative point. 

iWeb for positive:

  The Conversation UK

Supply chains expert: don’t panic if you see empty shelves – more stock is on its way

Because shops will be asking more from their factories, they will have been working around the clock to meet this demand. The sad irony is that …

Mar 26, 2020

iWeb for negatives:

1 WO N’T HAVE BEEN LIVING 5

  GiveMeSport

One thing’s for sure – he won’t have been living the lifestyle he’d grown accustomed to, as one of the greatest footballers of all time, during his 32-day spell in prison.

Apr 8, 2020

2 WO N’T HAVE BEEN DRIVING 3
3 WO N’T HAVE BEEN EXPECTING 3