I honestly do not think that any developer I know would be okay if they were told "write it in a way so it will stop working in a year". Maintaining old software is expensive and people do not want to pay. It is also way easier to just pull everybody with you to latest release (which is why there are so many subscriptions now).

edit: also, I do know a lot of developers that would not be happy to work on the maintenance of some old software.