Makes sense. Our choices are to either move out to the cosmos, or stay here and:
1. By 2600 CE people will be standing shoulder to shoulder with others, coverering all of the landmass of the Earth, as well as glowing red-hot from electricity usage.
2. The Sun starts to expand as it runs lower on fuel and makes the earth too hot for life in about 500,000,000 years, maybe much earlier.
3. The Sun expands and swallows up the earth after becoming a red giant as it burns heavier and heavier elements to make up for the lack of lighter ones. (1 Billion Years)
4. We kill each other.
To the cosmos!