I don't think it would be a big deal to get 1 point or maybe even 2 points per level and simply scale the rewards per point down in order to encourage at least a two-stat-dump over a one-stat-dump. That's not particularly difficult or involved to scale what's given, by what I know of how stats are probably coded.
I can definitely see not wanting to have to take all stats in this system, but single stat choices that ultimately seem impossible to balance without serious reconsideration (Constitution I am really not happy with you right now) seem to be worse. Indeed, who would ever throw it all behind speed, or much of anything behind speed? And yet trying to make all stats a single-stat-dump possibility is also going to be silly and yet seemingly be necessary if anyone is going to consider each stat as a real piece of content.
In brief, I think we could make 2-stat-dumps and 2-major-1-minor builds very viable with some scaling (more points for less power per point), and open up a lot more thoughtfulness in character development and replayability.
