It's funny.
I don't think this should happen. Maybe only a slight delay. The bitcoin network is over 256 times faster than the world's top 500 supercomputers together.
Still, I'm no bitcoin expert. Wait for a Sr. Member or something. Those guys know what they're talking about when it comes to code... mostly.
Are you comparing hashing power with the power to actually validate and confirm transactions? Hashing is merely a means of limiting the amount everyone can contribute to the network. You could theoretically "run" the miners on a handful Pentium 4 computers.