I suppose with electric carts becoming so comfortable/quiet/serene and luxurious (air conditioning, bluetooth speakers, seating, etc), a lot of people will want to cruise TV all day once in a while. Figure 8 hours at 15 MPH average = 120 miles. About 2.5ah per mile so you will need a 300ah lithium battery
How long do you really want to be in a gas cart with all that ruckus...and if you still have good hearing and still have a sense of smell?
A lot of people value serenity. You really don't get that with laughable gas carts.