Personally, I can imagine ORBX might switch to photo-based IF the sales for the initial products will be good. NL should be a trial balloon. Australia has been due for a remake anyway, well possible they might do it photo-based for AFS2, P3D and XP. It probably comes down to the question of availability of affordable satellite imagery. I think there is for NZ, but I don't know about AUS.
Plus this all will take time, although I could imagine photo-based scenery being less labor intense than landclass, even more, as they have some assets (POIs, buildings etc.) already available. Not sure about this, though.
Kind regards