I'm not surprised. On my previous job we only got rid of a last 2003 VM a year ago. It wasn't very critical though. But when i was leaving there were ~15 2008/R2 VM servers with some critical services running (although inside a LAN). I think many of them will stay on 2008 for at least a few years because of lack of IT staff, knowledge, compatibility issues and lack of budget for new licenses and hosting. And i can't imagine how they are going to move '6 servers heavily modificated SharePoint 2010 farm' anywhere. It's not that these problems are new in IT field. We have dealt with migrations from older systems in the past, but as IT becomes more complicated every day sometimes it just feels unbearable. Well, there should be a clear strategy and good planning to overcome such things. But that's another topic :)