No. I prefer to customize the details of my survivor mode by the mods I choose to run. Everybody has different preferences as to which features of a survivor mode they want and the particulars of how each aspect works. Mods are better for this and if you can't find the exact mod you want modify or make your own. I certainly wouldn't want Bethesda adding features that I didn't want and then have to get a mod to remove it.
Presumably a survival mode would be optional. If they implemented a survival mode you could simply leave it disabled and use a mod instead, no?
But this is academic, as there is such a slim chance that this will happen that we might as well say there is no chance at all.