I dunno about viewers but Big E can credibly be WWE Champion and even though he's getting up there in age people still love Kofi so he might have another singles run in him.
They don't give a fukk about the tag division anyway. People would get over New Day being gone for a while. Besides, what else is there for New Day to do besides sell more merch?
Then you got Ricochet and Velveteen Dream with huge star potential down the line. There's no reason but the
tendencies of the fanbase keeping this from happening. If it's the right guy and a credible story it can really work.