OLP will eventually be back to where it was. The single largest reason that UIGEA happened in the first place is the same reason that OLP will return, and that reason is taxes. There was too much money moving around without being taxed, hence the back-handed and backdoor crackdown, and there is too much potential tax revenue that can be mined for this market to be ignored for much longer.
Online poker isn't "illegal" in the USA, except for a few states. The UIGEA did not make online poker illegal, it banned financial institutions from doing transactions with online
gambling websites.
I just read an excellent book about the 2008 financial crisis called "Predator Nation," and I find it ironic and highly hypocritical that the government and its minions feel that the public needs to be "protected" from online poker, while at the same time they openly encouraged and profited from the rampant fraud and abuse that was perpetuated by the financial industry during this same time period.