I'm not sure I would be distressed with being 'left behind'. Most of my friends, and all the people I really like being around, are, by all accounts, going to get left behind.
Most of the people who loudly proclaim they are going are people I really don't like, and who I would rather not have to live around. I won't miss them much.
There is also the simple mathematical issues. The main source for predictions specifies 144,000 as the limit. There are millions, billions?, of people who assume they get their ticket punched. Sounds like there might be some disappointment on their part. Me, not so much.