XP is not "dying" I have servers running Windows NT 3.51 that still make more money an hour than 100% of the people here on slashdot. and they are 100% secure because they are on a segregated and airgapped lan.
When you have something working and you have enough spare hardware to keep it working, why waste money and time "upgrading" simply because some idiots think you need to. Short of someone doing a "mission impossible" break in my servers are 100% hacker proof. Oh and here's a tip they ALL have the administrator password set as password1234.
They are specialized servers that can play back 16 broadcast quality MPEG2 streams into digital video in CATV headends. 16 at the same time all from a single pentium 1 processor and barely any ram. the playback cards play the video directly from the SCSI hard drives. The replacement today from Seachange are less capable and break down more. These require nearly ZERO attention and continue to run year after year just printing money for us. and we have enough spare parts to handle any issues and give us a year lead time if we ever needed to do a complete upgrade to current tech. If an OS if supported means nothing at all if you have sysadmins and network people that actually have a clue as to what they are doing.