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Interstellar tries to suggest climate change is so important that if we don't address it, we'll have to figure out what gravity is in order to master interstellar space travel and find a suitable planet. Practically the only thing that would make Earth unsuitable for humans and leaving to be the easier option is when temperatures soar as the sun gets hotter and bigger billions of years from now.
Hawking is right that Humans would need to master colonizing of other planets, or at least mining resources from them, to survive very long term. Then again, humans probably won't much resemble humans a billion years from now. Heck, genetic engineering and the integration of technology will probably rapidly change what a human is in just the next 100 years or so, which is nothing as far as time goes.
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