Not sure if this is the right place to ask this question, or if anyone has the answer, but...

Have booked a multi-city, which includes a leg from Melbourne to Singapore, for October 2019. It's currently scheduled on a 777-200ER.
My understanding is that they're phasing out the 777-200s altogether, for A350s and 787s. I'm wondering what the likelihood is of that happening in the next 9 months?

If anyone has experience riding Business on Singapore's 777-200ER (6 across in Business), please share.
By the looks of it, it's going to be fairly dire