Sideline,
Here's another point of view.
1. You still get the cheering etc with 1 round, as has historically been the case. You don't get the chance to square up on a return, agree!
In the past no one worried about the square up.
You square up next year!
2. The word "trial" is unfortunate, as every 1st 15 team wants to win every game in a season, no matter who they play, so they do take them all seriously, that's why the made the 1st 15, imo.
3. Playing more schools with different styles does/can improve your rugby, as opposed to playing the same few teams over and over.
4. I certainly think that it depends on who you play, and you are right about an unbalance CAS in recent years.
So if some of these other schools include the stronger CAS schools, St. Auggies, Oakhill, St Pius then I think it would be better for all involved.
And when they go into the real world they will have played and met many more boys than currently.
Anyway let's just see what transpires, until then, this is all speculation.