"I think we should leave the system alone."

That is the belief of both the Democrat and Republican leadership, IMO. 

Both believe they know how to game the existing system and are reluctant to venture into the unknown.  Among other things, it would require a wider advertising budget.  This past year they could both concentrate on 7-8 States and ignore all the "solid' R or D States.  

Hillary and Podesta miscalculated as to about three states, but that was incompetence and hubris, not a rejection of the swing state concepts both the R & D's have come to know.