User blog comment:BigBrother1984/Borderlands 2 Skill trees/@comment-4955250-20120904205836/@comment-667748-20120909121928

In BL2, the trees are MUCH longer, meaning a much bigger investments in a specific tree to reach the key "Major Game Changer" skills at the bottom. Don't go thinking that like in BL2, you can just pick and match any skill you want: It won't even be possible to reach 2 different Major game changers.

Even with a level cap increase, or free skill points, it'll be totally impossible to unlock the majority of the tree.