It’s an interesting idea, but there’s no way it will ever happen due to to a few reasons. One is less regular season games a year equals less revenue. Another, if I’m reading your scenario correctly, is there will be ten playoff teams. The current configuration has 12. Less playoff teams equals less teams in the race which again equals……less revenue.
Baseball is getting less popular and the owners will do anything to make more money, period, even though I don’t think it’s good for the game allowing more teams in the playoffs. I prefer how it was when I was a kid in the 80’s or at the very least, the one wildcard team per league. But that’s just me. I can see an argument for the pre 1969 model as well competitively, if not dollar wise.
But yeah, you’re right. The lines between AL and NL are very blurred now.