I said it in the other thread : All for a download version of OS X Lion, but it should not be through the app store like the current DP. Checkout should provide you with a disc image that you burn to your own DVD/USB Thumb drive.
It's how Linux distributions have been doing it for the last 10 years.
Or if it really must be through the app store, provide a small disc image download that when booted off of, just provides an interface to sign-in to the App Store and install Lion, like RedHat was doing in 1996 with its "NetInstall" floppies that were just an installer than fetched its media over FTP or NFS.
i'll have no problem with it being in the App store, so long as disc backups will be allowed (and easy to accomplish).
Currently, 0% of app store products come with the option to make a physical backup. sure there's ways to do it, pretty easily in fact, but no apps are sold with this in mind because there's never been an app that'd need this feature before.
I personally wouldn't buy Lion from the App Store with the current store's setup, and I wouldn't recommend it to anyone else either.