I don't understand why anyone would oppose the "lite" version.
*You can still ride the "regular" version.
*While you're riding, your elderly parents or grandparents can finally enjoy the A/C inside Mission Space and play with the capsule's cool switches and lights and buttons while watching "that guy from CSI". It sure beats waiting for you in the hot sun, watching people emerge from the gift shop barfing in the bushes.
*You won't have to go back to your hotel room early when one of your travel partners--- who insisted on riding Mission Space because they saw the cool TV commercials and brochure ads back home-- loses their lunch all over your one-and-only pair of tennis shoes.
*People who want to experience Epcot's signature attraction during their once-in-a-lifetime trip will not feel "pressured" to ride something their body may not be ready for. (If you're paying $60 for a ticket, you want to get your money's worth, even if it means pushing your body to the limit). By offering a choice, the moderately-healthy-but-not-quite-as-strong-as-my-younger-days visitor will feel they got the experience M:S without risking a day-long headache and queasyness.
*M:S has never lived up to its full capacity. A new attraction should NEVER average a 10-15 minute wait, even if it is a high-capacity "people eater". By opening up the ride to a wider audience, M:S will finally process the thousands per hour it was designed to do.
*By giving motion-sickness-prone riders an alternative ride, its less likely the 3 "regular" centrifuges will be shut down for a "Code-V" while janitors sprinkle pink pixie dust and mop up the "protein spill." In fact, with the new set-up, I bet the 3 "regular" centrifuges will actually have a higher capacity than with all 4 running at full-G and causing "Code-V" interruptions.
*By forcing visitors to make a choice, more people will take the warnings seriously. That's because they'll literally have to stop and ask themselves "Do I really want to go on the intense version?" And if that means one less family carrying a loved one back home in a body bag, it'll be worth it.