If getting waterskiing in the olympics is the goal, is trying to fight the IOC's requirments and constantly just asking to be let in "as is" a good approach?
I think its agreeable to say cable skiing should not be the answer, it was possibly a step towards it, but in no logical way does it simulate a boat. If you consider the sports which involve motors, its not the motor that they want to eliminate, its the incosistency which can cause an unfair advantage to a certain athelete. How many times are there threads about poor driving in tournaments or practices? It's about eliminating margains of error, not arguing about the subjectiveness of current olympic sports.
When designing something to simulate a boat, I think of the what the boat does(in the case of slalom only)...travels down a straight path, has to allow the skier to drop at each end and return the apposing direction, constanst speed attained within 100-200m, constant height of the rope off of the water.
Given those criteria, its really not hard to build a rail(similar to rollercoasters for a visualization) and pole system which could be operated by an electric motor. You would have to have a generally flat bottom lake, that wasnt more than 10-15 deep, and it would be costly. But not impossible, giving you the pull of a boat with no cable stretch or awkward angles and the benefits of no wake. As an engineering student, this is something i really want to push further, atleast to design in the hopes someday ill find the funds to build something like this. How awsome would it be to never need a ski partner or driver? Considering even a remote you could where to bring the rope back when you fall. The possibilities are pretty exciting.