IMO it's probably easier for a private company to go straight to an exchange rather than graduating up from the OTCBB. Some OTCBB companies do move up to exchanges, many of which have been financial institutions. The number doing this though is very, very small compared to the overall total out there.
I seriously doubt Glenn has his sights set for Nasdaq or AMEX. CMKX has way, way too much to do before they will ever be considered. Yes, it is possible but the probability of it ever happening in your lifetime is 0% or very close to that.
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"We simply attempt to be fearful when others are greedy and to be greedy only when others are fearful."
-- Warren Buffett