Speaking as one of the guys who supposedly "ruined" World Finals 16 and 17, let me provide my input:
The fan scoring now, I think, prevents that whole shabang of "So-and-So should have won and the fan judges blew it!". MJ has always kinda promoted the idea of keeping the fan interaction involved with the "judging" of the Freestyle competition, so that's why fans will continue to be factored-into the decision of who wins each competition. It's part of their shtick, so they're going to continue to roll with it. In the end, doing this is far less controversial and it's more "fair", in a way I guess, in that it supposedly gauges the entire audience there and what they think was the most exciting run.
If it works, it works. If not...it's still experimental, and there's really no one to blame but themselves. Works better than me being harassed for an entire year, I'd say~