The genie IS out of the bottle when it comes to technology in general. There is a hack for everything now and people are smart enough to use Google to find these sources of info. NOTHING can 100% prevent ANYTHING, in life or especially on the Internet.
Having said all that I, as a paysite owner and content creator who started in 2008 or so long after 'the good times', I would welcome an effective age verification solution. Sales would not return to pre-2010 levels but they would most certainly go up. The big tubes could also survive having all implemented a paid section.
Speaking of which: tubes should also implement one-click upsells to the paysites who provide the free content for these paid sections so a Member can more easily join the contributing paysite. Just a thought.
