In your head, probably.
In the real world, not so much. Reality has a habit of constantly proving you wrong. Hence 
Of course not, because they would prove you and OP dead wrong. Because noone cares about SSF outside of 5-10 people in the entire D3 active playerbase.
Solo play goes against what Blizzard wants D3 and D4 to be - primarily group-played games. That’s why MP gets so many bonuses, and solo doesn’t.
If they cared about solo, they would include exclusive buffs that would assist solo play OR not add any buffs to MP. But they don’t, because they want us to play with each other.
That is why you will NEVER get SSF in D3, D4 and beyond.