You will probably make it. Took me about 2 hours from touchdown to get to the BC and it was just me and there were no lines for anything.
When we flew home the last time, it took us (2 adults, 4 pieces)45 minutes to get our luggage - Song, not Jetblue. You will also have quite a few pieces if you are flying with the family, so that could also take some time.
I just rented from Thrifty last week - Bluechip. The only hold up we had was that we had to go to Thrifty long-term parking to drop someone off. With Bluechip you still have to go to the counter - unlike Hertz - so you still have to wait if someone is in front of you. Also, sounds like you might have a couple of carseats to install with a 1 and 3 year old.
There are a lot of reasons why you might not make your reservation. Maybe you should change it to 1 pm?
We were just at WL last week around lunchtime and WCC was empty, so it may not be an issue if you are late.