It already could hardly be easier by booting the DVD. Takes about 20-30 minutes tops.
Reinstalling Windows 7
Using the huge unwieldy WAIK to make a WIM and then spanning DVD's would be more work than a lifetime of reinstalls - especially because once you get a good install set up you can save a backup image which can reimage to HD or replacement in 20 minutes flawlessly, making reinstalls a thing of the past. Backup Complete Computer - Create an Image Backup
System Image Recovery
the modern methods.