Earlier quoted context omitted.
Actually, yeah, it will be cracked, by someone . And E-Mail-addresses aren't passwords; trying a few hundred variations for each firstname for each lastname is perfectly feasible and should crack a nice percentage of these hashes.
My email is firstname@companyname.co.nz (I have a few of these at different companies). I'm fairly confident this isn't going to be cracked any time soon by random MD5 hashing. (of course, my real name can be extrapolated from my HN username)
$500 graphics cards can run a dictionary against a md5 hash at the rate of 700,000,000 per second. That is 0.7 billion per second.