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Interesting subject and to be honest in 5 or 10 thousands years time I think we will be still asking the same questions.
The distances are just too vast to get a definitive answer. Even if future kind could build a spaceprobe that could travel at the incredible speed of 1 Million Km per hour it would still take 5,000 years to get to the Alpha Centauri system.
At the moment all we have going for us is the very slight dimming of a stars light to suggest a planet passed in front of it. Not much to go on I'm afraid.
It is possible in the future we may find evidence of microbes on Europa or another of the Solar system planets moon but thats about it, unless ET visited us and that would be scary.
Bill.
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