Yes, they would. But they don't, because it's better for the league if the best players are playing in the league. The league would be far worse off if they didn't have these 19 year olds playing in it, it's not debatable.
...but it is, it's all marginal and relative
I mean, the CHL could have eligibility go to age 22 with a transfer agreement in accordance. What's the difference? It's all arbitrary anyways.
The CHL wants to cry poverty on this, but there's no reasonable basis for the claim. They just want the rights to as many players as they can get for as long as they can get them. The structure doesn't depend or need it though,
which is the whole argument for why this "needs" to be in place every time the discussion comes up on the main boards and it screws over a small number of kids (that are actually legal adults) every year.
The original topic was "survival", not "nice to haves", just like it'd be nice if Duke got 4 years of Zion Williamson, like it was more common back in the day.