Even if Windows 8 is a complete failure, it would not be the death of Microsoft. It's not like they have never had an OS fail before.
Windows 95 full of problems
Windows 95B stable / great OS
Windows 98 full of problems
Windows 98SE stable / great OS
Windows ME complete failure
Windows XP stable / great OS
Windows Vista complete failure (in the beginning)
Windows 7 stable / great OS
Windows 8 we'll have to wait to see
Can you " upgrade" from Dev preview to Consumer preview? Or do you have to do a clean install?
Artix, this should let you install from USB - http://www.microsoftstore.com/store/msstore/html/pbPage.Help_Win7_usbdvd_dwnTool