Only if the games support it so it means only future games. Current games will not see this benefit, in order for them to benefit the devs will have to go back and add dx12 support to them and enable this specific feature which I doubt many will do.
If one looks at Witcher 3 it's a total miser with using VRAM, apparently even at 4k resolution it uses less than 2GB of VRAM, why can't other dev houses do the same? In such a massive open world you don't even have loading times, it's frigging amazing!