You really need to learn reality and economics.
First, you act like all the software in the country is COTS when a huge, if not the major, proportion is software custom-written for government and business. Most of the developers who answer want ads are not going to work for Microsoft and Adobe, but organizations needing internal software written (or contractors to those organizations).
Second, you seem to believe in the broken-window theory of economics. Find out what it is, then think of COTS software as the baseball.
Open source is lowering the value of U.S. software on a daily basis. Just this last week we had IBM giving DB2 away and VMWare giving away GSX, essentially lowering the value of IP for that level of transaction to $0. As the dominoes continue to fall, COTS companies will lay off more, just as IBM and Sun have been doing, and those attempting to survive on customizations alone will continue to see increased competition between themselves, forcing prices and wages to fall there as well. The U.S. will quickly lose its current technological lead, if it refuses to protect the value of its intellectual property. Open source is obviously one of the most significant threats we face, especially as it becomes closer and closer intertwined with the UN and DNC.