Looks like you have not been in a large ski resort lately - throughput of common cable transportation is at least double the 720 pphpd you estimated. There are now 40 years of experience in increasing cable car throughput. As urban transportation, Medellín and Caracas put 3000 people through per hour in each direction. The Rheinseilbahn in Koblenz gets 3800 people per hour across the river in each direction. 6000 people through per hour in each direction is nowadays considered within reach of the current technology.
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Looks like you have not been in a large ski resort lately - throughput of common cable transportation is at least double the 720 pphpd you estimated. There are now 40 years of experience in increasing cable car throughput. As urban transportation, Medellín and Caracas put 3000 people through per hour in each direction. The Rheinseilbahn in Koblenz gets 3800 people per hour across the river in each direction. 6000 people through per hour in each direction is nowadays considered within reach of the current technology.