No one is going to argue (at least not strongly) in favor of running business applications on an operating system that does not get security updates. Compliance teams will see this as a huge risk and will move heaven and earth to remediate it. In the next 12 months many IT departments around the world will be assembling WS2003 EOL SWAT teams to address this challenge. This will be like a mini Y2K forcing function for most enterprise IT departments.
IT departments hate end of life of products and the resulting headaches. End of life for a product means the support lifeline disappears, security updates stop and IT is left stranded with the compliance team breathing down their neck. Upgrade projects are not a fun sell to the business. «Hey, Ms./Mr. Business, let’s invest a bunch of money and time to get the same place you were before»… Gee, let’s get out the drill bit and do a root canal while we’re at it.