Some interesting ideas in that proposal but I do think it misses some of the points.
-Full realignment is just not something people wants. Stick to the current leagues maybe move a team or two to reduce travel.
-156 games is an issue. But tell the players to give up 4%-5% of their salary and it is a non-starter. Give the players a greater share of revenue and maybe that is possible. To me though, the number of games is not that important because both the players and the owners don't want to make less money
- 8 team divisions. Good. Fewer weak division champions.
- Revised schedule. 12 in own division. 3 against everyone else. I am fine with the 12 (or 13 if you go back to 162 game) schedule in division. But just play 6 against the other division in your league and then 3 against one of the 8-team divisions in the other league. Never liked the rivalry series (like NY vs NY) because it is unfair to some teams
-Playoffs - Really want more than 1-game wild card series. It is just too random. Again eliminating the play-in day (and maybe all travel if the wild card series is 3 games) is the way to go. 3 game series all at the home park of the higher WC seed.
I'd be shocked if something like this happens though. Just too many conflicting motivations among the parties involved.