>>roboca+f5
Given where the technology is now, there's no scenario where thousands of men won't be doing this within a few decades. It'll get easier, safer and cheaper over the next 10-15 years of experimentation and development, putting it within reach of a lot more people. The number count won't be very high early on, it'll still be an incredible technological achievement.
If 30 years out just 1 in 100,000 men are doing this at a given time, it'd be over 100,000 male births annually on the planet.