Here's what we know: Ridge Racer 7 will have an optional 5 GB HDD installation feature that's in place to speed up load times. Currently, Ridge Racer 7 and Genji (4 GB install) are the only games known to include this option. While this will almost certainly change, there's little reason to believe that HDD dumps will become a PS3 standard (unless you buy Sony's "it's not a console, it's a computer" mumbo jumbo).
Anyways, waiting 9 minutes and 46 seconds for data to install isn't as agonizing as we'd sometimes like to believe; especially if it's a one-time (or once in a while) procedure. On that note, let's wait this conundrum out for a while longer, watch how it develops.