Well, when viewing only this quote*, I would just take it that he believes the MGS story is finished and he wants to move on to something else. Whereas Konami see "$$$", so they wanted another MGS game and they wanted it multiplatform, especially since this spin-off would definitely not sell as much as MGS4 for PS3 did.
*I'm sure it would be helpful to see the entire interview translate, or more of it anyway, to give this a little more context.







