They may have to offer a 1GHz G5 in single, dual, and cluster configurations. But then beef the architecture up. Use some kick ass blowers and heat syncs. I doubt this product will be quiet. But they will likely have lower prices, especially since the G5 chips themselves are relatively inexpensive.
Thus more people will opt for the Cluster options, and fill up a 42 U Rack, and have all the power they need. More than before, that is.