I believe the enterprise edition of XP is supported by MS until 2019 and that support can even be extended. We still have several devices running XP that are fully supported.
•”Windows Embedded Standard 2009. This product is an updated release of the toolkit and componentized version of Windows XP. It was originally released in 2008; and Extended Support will end on Jan. 8, 2019.”
•”Windows Embedded POSReady 2009. This product for point-of-sale devices reflects the updates available in Windows Embedded Standard 2009. It was originally released in 2009, and extended support will end on April 9, 2019.”
Microsoft could easily continue supporting XP for small users since they are doing so for enterprise users.