I beleve the biggest technology advance will benefit electric carts. I'll go out on a limb by stating that within this decade, electric carts will be the vast majority of carts here in TV because new battery technology will increase the range carts will be able to travel.
There have been a number of published announcements made over the last couple of years about breakthroughs in battery technology from start-up companies and other well established companies that may surprise you. IBM, as an example, announced they have developed a lithium air batterry with a 500 range for electric cars. If interested, the link to the announcement is below.
IBM Develops a Lithium-Air Battery With a 500-Mile Range for Electric Cars | PCWorld