That's just the way it is. Vanilla Borderlands 1 had only 46 skillpoints as well. With Mad Moxxi DLC, it was possible to add 2 more, one for each playthrough. General Knoxx DLC added 11 more levels, and thus 11 more skill points. Claptrap Revolution DLC added two more as well, one for each playthrough. Finally, the games max level was modified in a general update by 8 levels, so 8 more skill points there as well.

So, if you hit the max level of 69 AND got all four of the bonus skill points from Mad Moxxi and Claptrap, the total skill points in Borderlands 1 was 69 as well.

However, Borderlands 2 is going to start out just like Vanilla Borderlands 1 did, So, first 4 levels you get nothing, then from 5 to 50, you get 1 skill point per level, max hitting at 46. For all we know, they will add DLC that increases the max level which will thus raise the number of skill points. Throw in the idea that some DLC might give a bonus skill point as well, we could very well get more. It's possible, but doubtful, that any bonus missions in Borderlands 2 will give more skill points that you won't need DLC for.

The harder the game, the more likely you will scream and try to throw the game out of the window.