CHL pays players, but USHL and BCHL do not.
Now, junior players can play in the CHL, get paid, and then have the opportunity to play in a significant development league in the NCAA, getting a legit college degree at a decent university. This move helps smaller schools like Union, Lake Superior State, Bemidji State, Vermont, etc., which can now attract good CHL talent to continue their hockey journey.
USHL and BCHL teams will be considered a secondary option for the likes of players who are on non-USNTDP clubs. For example, why go to Youngstown Phantoms when a decent, talented player can go to Owen Sound, play against good competition, get money, and still keep his college commitment to Michigan State, you know? There are still roles, and the issue of being in the top 6 for a team like the Victoria Grizzlies is better than being in a bottom six role for the Vancouver Giants, but in terms of incentives, this is a win for the CHL because now they can become the major junior feeder system for the NCAA. CHL might lose players earlier, but there is a good chance that they will attract more top non-Canadian talent.