You are very correct. But here's the situation, port now or long term you're going to be screwed. The updates coming down the pike from Microsoft are designed to lock you forever into their world of upgrades, designed incompatibilities, rights management, etc. The article above doesn't address any of the very big problems which come on the edge of three years out.
Im in no position to tell one of the largest Insurance/Finance companies in the United States with International reaches to chage all their apps.
You may be right, but the cost just cant be justified with the shortsightedness of upper management.
Huge companies have to either suck it up and pay (both financially and time) or forget it. Forget it, to them, looks alot cheaper to them.