The CHL is a gate-driven league that relies on marquee players, especially name-brand prospects, to drive attention beyond the diehard fans of the sport and of CHL hockey in particular. Especially in markets where the existence of pro hockey creates a sort of smug "little brother"ing effect as fanbases of casual hockey fans think themselves too advanced and cultured to watch anything but the best of the best that the sport has to offer. And there simply aren't enough Connor Bedards coming through the ranks to draw people out to watch pre-draft players. Spoilers: the crowd size for a game with Landon DuPont or Gavin McKenna here with the Giants is not much different than a regular game. but if a big-time Canucks or Leafs or Oilers or Flames prospect rolls through you can definitely see a spike in attendance.
The NHL does not subsidize junior hockey enough to be able to offset the losses the league would take if suddenly teams decided that basically any 1st or 2nd or even maybe 3rd round pick that they've drafted would be better off in a pro environment than in junior.
And yeah, the NCAA now presents a somewhat enticing option, except it mostly doesn't for high-end players as you can't sign a contract and still go to college. So NHL teams can draft CHLers, sign them to an ELC, let it slide for a couple of years while they still play CHL hockey then bring them up to the AHL for their over-age season. The guys that are mostly looking to go to the NCAA right now are either ones who are disgruntled with their situation in the CHL or mid/late round picks trying to extend their pro auditions for a couple more years because they haven't earned a contract yet (one of the first NCAA commits out of the WHL was Giants forward Connor Levis, a Winnipeg 7th rounder a couple of years ago who's been good but not good enough to get signed. He's in his age-20 season right now so this is his last kick at the WHL can and a couple of years at Bowling Green will give him the chance to maybe get some more scouting eyeballs that they wouldn't get if they cashed in their CHL scholarship program credit to go to a Canadian university, while also considering actually using the schooling option to get a degree if hockey isn't in the cards.
I get why the suggestion gets made, because usually it's coming from people who wouldn't watch a drop of amateur hockey except where it pertains to scouting pro prospects so the actual concern has absolutely nothing to do with junior hockey itself, but this sort of "how dare this business run itself like a business instead of catering to the thing I want them to do" is kind of a blinkered, myopic way to look at it. I'll concede that nobody gets into the CHL ownership racket to make money since it's not really a profitable thing when you consider how frequently teams move around, but even as a hobby investment you still want to make sure you're not just taking a constant bath on it when it's not like most team ownership groups are NHL caliber owners with billions in their pockets who can write off a several-million-dollar loss every year as being like losing some change in the couch cushions. My team is owned by a semi-local restaurant franchisor, one of those Property Brothers goobers, and Michael freaking Buble. Deep pockets compared to the average person, but not "burning suitcases full of money on the regular for funsies" deep.