Will take longer than 2019 if you ask me, they need to be playing against top tiers regularly to know where to benchmark themselves.
10 years and we could see some exciting rugby from them.
I think what we must remember is... They take like the top 3% of athletes for NFL, if not less. Just imagine it, a professional league for rugby, to tap into all of that other percentage for people to reach their dreams of becoming a "sports professional". It is really quite a major thing. It is not like the college football players that don't make it have anywhere else to go either, you don't just switch to basketball, or ice hockey. There is literally only the CFL (Canadian Football League), rugby is something you could switch to almost instantly...
Just as an example, you have guys that could borderline make the USA Men's Sprint team, that don't make an NFL team. There is a crazy amount of talent out in America, that never make it anywhere.