My New Big Question

So this was my original question. However, as I was trying to watch a YouTube video there was an ad. An ad in which a man begins to experience some heart problems and this heat problem gives him a scare. This man, Matt Prindle, (in his video that I watched in the ad) had a funny yet serious part that made me both giggle but also helped me come up with my new question. That scene had the following words spoken: "This is the beginning of something pretty amazing. Sometimes it takes a serious health scare to get serious about what's important. Being present. Soaking in all this. Enjoying it! Pursuing it! And having fun along the way right? Which might mean to...means to go out on a limb and have some fun...." I have always thought of this situation already and tried to make something out of it so I can pursue a related question, but I wasn't sure what I wanted to find. But now after having seen this video of Matt's I have my  question. My new question is along the lines of why does it take something to happen in order for people to realize that they must live in the moment and cherish what they have? Why waste time in waiting and not start loving everyone and everything now? What happened to living life to the fullest? What is possibly holding us back? I guess I can tie the two concepts of time and cherishing life before it become too late together because I do not want to entirely give up and throw away my other question because I am still very much interested in finding out more. I am wondering at this moment if I will be able to tackle two questions?

You have to watch to the end now in order to see what I was talking about above!