Depends probably all on how well the PS4 will do in Japan and other "important" J-RPG Territories.
If the PS4 has a big enough install base such games could sell good enough to justify the effort.
Of course we are talking about a Console Grandia.
There is probably always a chance for a Handheld or Mobile Grandia or at least something that is using the name.
So right now i rather see the franchise staying dead







