I don't believe that's true. At least, you can't buy it anymore. So your business can't hire another FCP 7 editor without trying to find a copy on ebay or pirating it.
You can still buy support, just not the application itself, direct from apple. There are as yet options to get NOS of FCS3 licenses, and I suspect if the situation actually gets to the point where people are being forced to pirate it, Apple will reopen phone sales.
http://www.videoguys.com/Item/Apple...cluding+Final+Cut+Pro+7/14F2A523436324D4.aspx
http://cgi.ebay.com/Apple-Final-Cut...ultDomain_0&hash=item1e64c1624e#ht_798wt_1020