One simple solution to slightly refresh the conferences would be to introduce a minimum of 2 new teams on both sides each season. This can be done by switching one of the relagation playoff winners to the other conference in case the 6th and 7th place teams of the same conference win their series. The problem with this is that the refreshing happens with potentially weaker teams (especially if the switcher is the 7th, although they did just beat the 6th of the other conference). In this case, the aim of balancing the competition would not really be achieved. Especially so for div I leagues.
Actually no. If you have a stronger conference, they will win both relagationseries making the strong konference even stronger since only one promoted team(weaker?) joins. On the other side, 3 newly promoted teams enter.
But then there is also the opposite extreme. What if the four promoted teams all ends up being the best?
Over time it all evens out.
My take on the schedule, taking in account the number of games and weeks a season is, is that it´s very difficult to change.
Making the "other konferencegames" random between all teams no matter konference could be one, but then schedule play an even stronger role then it does right now. As of now, getting your homegames against the right opponents is a big deal. As is getting one strong and one weak team every week instead of two week teams the same week and two strong teams the other week.
If you (with random) end up playing four week teams and your rival ends up against the top four teams, it will make a difference.
So I´m not a big fan of adding "chance" to the schedule.
As a last note, as we speak of trying to make managers aim for a higher spot in the standings. What if the "other konferencegames" are somewhat related to last years standings?
Example: (if BIG1 won BIG and had more wins then GREAT1)
BIG1 vs GREAT8 (one "easy" game a week. Away against the "weaker" team.)
GREAT1 @ BIG1 (gets homegame against other "topseed")
BIG1 vs GREAT7
GREAT2 @ BIG1
BIG1 vs GREAT6
GREAT3 @ BIG1
BIG1 vs GREAT5
GREAT4 @ BIG1
The highest ranked team gets the "easiest" schedule.