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I think any number other than zero is not only possible but likely. Repeating Alex (m4a) the likelyhood of them co-existing at an equal level of evolution as us and further more being even something similar enough to us to be able to communicate and have the desire to is equally unlikely and yet still possible.
The fact is that regardless of what we do to this planet, the sun will remove us from exsistance anyway when it starts to run out of fuel or when another massive meteorite hits earth etc. This is the same for any exoplanet. What are the chances that any civilisation including our own will be developed enough to be able to collectively remove itself from this danger in order to be in the position to survive long enough to equally discover each other at an equal point in time ?
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