I really see no problems with file size. The only time I will shoot RAW is on the second card as backup for Weddings and possibly when taking a few special Landscape photos. For most Events where I take thousands of images, I expect to shoot 5-9 MB JPEGs. The background will determine the size which averages 6MB with a D7000. The Video files will probably be the same size as the D7000, D5100, and V1.
I already have three storage hard drives in my main computer + one Widows 7 drive. They are 2 TeriBytes each. Plus I have an external USB3 raid with five one TeriByte drives one of which is a backup, and 3 more computers. The primary computer has an 8 core AMD Processor + 16GB RAM which is pleanty.