Bummed that "could" here means "could theoretically", not "might".
Don't get me wrong, I would love it if loads more people were to get a PGP key and enter the PGP web of trust (like, say, paypal). It's just that over the last ten or so years, I have found remarkably few people who both have a PGP key, and care about it.
But a pre-product announcement from Google doesn't mean much, since they work on so many products. If they do decide to push it to "beta" (ha ha) I'll happily use it.
Either way, I would hope public key crypto does become more mainstream, especially in email.