If by saying "it was not then", you are denying that the sport was in better shape back then ...well, you are simply wrong. And, like really really wrong. By all metrics used to measure the health of a sport (TV ratings, average attendance, national interest, etc.), college basketball was clearly doing better before the one and done rule than it is now. This is not disputable to rational people.
That's why this G-League thing doesn't bother me. If college basketball was still able to thrive without a token season from guys like Lebron, McGrady, Garnett, Kobe, Dwight Howard, etc., then I'm pretty sure it can also survive without the likes of Jalen Green and Daishen Nix. Hell, I think it might even be better without players who clearly don't want to be there.