Just the fact that someone at Reddit is publicly discussing the possibility of accepting Bitcoin is compelling anecdotal evidence that Bitcoin is on the usual path to wider adoption of all innovative products. It now appears to be expanding from a tiny number of innovators to a still-small but considerably larger number of early adopters.[1] I'm persuaded Bitcoin is likely to gain much wider adoption over the long haul.[2]
Kudos to Reddit!
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[1] http://upload.wikimedia.org/wikipedia/en/4/45/DiffusionOfInn...
[2] I've written down my reasoning at http://cs702.wordpress.com/2011/05/29/on-the-potential-adopt...
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Edits: added context; made my point clearer.