4-minute mile

 I was thinking... what if adults gaining stereopsis is a bit like runners initially breaking the 4-minute mile barrier?  Initially people thought breaking the 4-minute mile in running was impossible.  Then it was done by that Bannister fellow in the 60s.  Then once people realized it was possible, then it became possible, and tons of people began breaking the 4-minute barrier, and now it's not even considered to be that impressive.

What if once people observe adults gaining stereopsis late in life, and it becomes a thing, then that encourages many more people to try their hand?  They will realize it can be done and then say 'If that person can do it, then so can I.'  And then swarms of people try their hand and achieve stereopsis.  Perhaps it requires a critical mass.  What if this 'critical period' idea in psychology does indeed need to be revisited?  

The interesting thing about this idea is that it could mean a lot more people will fix their vision.  But it will also do a lot to change the way that people think about neuroplasticity and developing new skills in general, which could have far reaching consequences for the quality of life of many people.