Keep in mind, there is much more to the program than "transitioning to college". You are taking classes and earning credit while you are at summer experience as well. The classes that you take during the summer gives you a head start on your college course load and allows for more flexibility down the road. Beyond that, all my friends who did summer experience (I didn't personally, I was working) really enjoyed it and were able to meet a lot of people prior to coming in August.
Dont worry though, if your students can't attend, they will not be "behind" or out of the loop. Its just an alternative way to get credits, and build your confidence coming to college. I did just fine getting used to college life even though I didn't go.