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People make fuss about nothing. Didn't they find some fossils at some point in time?
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They found some blobs, but no-one was able prove definitively that they were single-cell creature fossils and not just crystals or air pockets.
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Why do people insist that would be that ground-breaking? I mean, on what basis? Let's say they did find water and microbes on Mars, and they turn out to be really similar to what we've got on Earth, nothing that would be really outstanding if it was found here. Will the humanity stand up all together waving hands and shouting "Yay for microbes!"?
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There are two possibilities. The microbes might be similar to what we have on Earth (e.g. DNA, RNA, mitochondria, similar chemical structures), which would suggest very strongly that Earth had been seeded from life on Mars (or possibly the other way around). Or it might be completely unrelated, which would be fascinating to learn about
and tell us something significant about the probabilities of life arising independantly in other planets.