Kimmel is a problem because he perpetuates the myth that pre-existing conditions are the sticking point, which you also fall for. Pre existing conditions are a necessary evil to make insurance affordable, otherwise nobody would buy insurance until they got the condition. At that point, it's not insurance.
The bigger item is portability, similar to what exists in employer plans and Medicare. Once you have insurance, you can transport the plan along with your pre existing condition.
But G-d forbid that people take time to educate themselves on the matter, when they can get teary eyed on the screen. Kimmel doesn't even realize that his grandstanding would be worse for future cases like his sons.