I like the 150 point idea if they implemented a side ruling that no one kind of ship could take up more than 50% of the available pool. Basically, there would be no 12 academy tie swarms which I think is crazy anyway, but it would also require some more creative squad compositions.
Well, you'd kill off double Decimator, any form of brobots, or double Firesprays, but Han+Dash+Escorts would totally be a thing, as would Bossk+Fett+IG-88*. I suppose you could do no more than 100 points on any one type of ship, but that still feels clutzy and arbitrary.
Frankly, if you want players to build more diverse lists, you're better off creating scenarios that encourage players to use lists that can perform a wide variety of tasks, which is independent of point limit.
*Assuming the YV-666's dial isn't so awful it's unplayable, of course.