Bro, if these guys are "Professionals" and DON'T care then they probably shouldnt be playing on a Professional level.
If you really honestly truly believe that Championship points is the main factor / contributor of a players motivation then the system or players have obviously been extremely tainted.
You shouldn't need a Incentive to Perform when you are already being Paid. I mean I can't imagine these teams players saying "Ya bro, I'm making 300k this year, They got rid of Championship Points so I'm just not gonna try this Split and maybe during Summer I'll Try lol, Ok Boomer"
If that's honestly the image you have about the players then there is something really wrong with either A) The Players, B) The League or C)Your Perception of the Players.
Like honestly, I know you aren't trolling or anything but your Premise is just ridiculous. This is a Job that they have to perform every year at and the moment they don't they will be benched / traded or just released altogether. The volatility of these Rosters are insane and the only way to actually stay afloat is to Perform consistently Every Year, Not just 1 Split. What are you even watching? I mean have you ever heard these LCS Teams even talk about Worlds? Almost NONE of them have Positive Realistic Expectations if they go to Worlds they aren't planning on "Winning", like holy smokes I'm so tilted right now after reading your post