I don't know how long the show intends to go on but I think eventually the ending has to have some sort of deliberate intimacy (at least attempted) that will be the final catalyst for Norman going over the deep end. The last episode with the spooning and Norman taking on Norma's persona and voice was over the proverbial top.

"When the snows fall and the white winds blow, the lone wolf dies but the pack survives."
Winter is Coming

Now this is the Law of the Jungle—as old and as true as the sky; And the wolf that shall keep it may prosper, but the wolf that shall break it must die.
As the creeper that girdles the tree-trunk, the Law runneth forward and back; For the strength of the Pack is the Wolf, and the strength of the Wolf is the Pack.