Yeah, i agree, they wouldnt do that.
I feel like the VR38 will always stay specific to the GTR only.
And without a doubt, I'm sure the R35 will end up winding down production now with the release of the Z35 and stopped for a while,until the R36 is ready to go.
The next GT-R should go hybrid power, that will up output quite a bit. And hoping the 400Z poweplant, if related to the Q60 TT, be 'modular' enough for easy servicing and modding