re: The official Interstellar thread (spoilers)

Also... The amount of time that we are talking for Hathaway's colony to develop the ability to operate in 5 dimensions has to be insanely long. Hundreds of thousands of years? Millions? Why would they care to go back? Obviously things worked out well for them. Would they even remember? Our civilization can barely keep track of what happened 4,000 years ago. More importantly, why would they set in motion an event that potentially could change the last hundred thousand years of their evolution?