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When the moon was closer to earth, was it still possible to witness a total solar eclipse millions of years ago? Or was the view-able space so small that it was impractical to even witness it?

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The moon is moving away from Earth. So in the past it was closer and its shadow was larger so a wider area experienced a total eclipse.

At some point in the future (in about 0.5 Billion years) a total solar eclipse will no longer be possible because the moon's shadow won't fall on the Earth.

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I definitely agree with that. An article says that the moon is going away at about 3.5 cm/year. Might look small. But, a long count of years would take it away very easily. Its also slowing our rotation period. This article states the same: "In the distant future, the Earth will have a day which is 47 current days long, and the Moon will only be visible from one side of the Earth" Then, we might have to call out: "Hey Moon - Where r u?" when going to bed :-) – Waffle's Crazy Peanut Dec 29 '12 at 7:23

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