30 minutes would not give you enough time to preboard, and if your first flight is even a few minutes late or the gates are not close together, you will have a lot less than 30 minutes. If you need wheelchair assistance, 30 minutes for sure wont be enough.
When we have had a tight connection, we have called the airline and told them we had a member of our party in a wheelchair. They have switched the flight without problem.
I asked my Coordinator the other day if we could change our flight and she said the airport we are going to is small and we should have time. I agree that if our flight is a few minutes late it's going to cause issues but she said to just leave it be. I don't know what to do. I really don't think it's going to work with only having 30 minutes for layover...I'm just worried on what to do.

Quite a few attractions have wheelchair accessible ride cars. Heres a picture of the Buzz Lightyear accessible ride car. The back of the car folds down into a ramp with space for one seated person and one wheelchair in the car.
Even though the name does not sound very tame (Buzz Lightyear Space Ranger Spin), the spinning is actually low a low speed turn. You can spin your ride car, but dont have to.
You can find my photos by going to the DIS site photopost page and doing a search for SueM in MN.
You need to log in with your DIS name and password in order to search. I have photos of most of the wheelchair accessible ride cars posted there - if any are missing, I have pictures, but just have not had time to post.
Posts 18, 19, 20 and 21 on page 2 of the disABILITIES FAQs thread has lists of all attractions. The ones bolded are fully wheelchair accessible. The ones in
Blue bold have a special wheelchair car.