

I used to work in healthcare IT until around 2008ish. Various clinics had things running on 3.11, 95, 98, etc.
For the 3.11 case, it was only controlling the door card/lock system IIRC and was not otherwise on the network, but some of the others, less so. We didn’t have direct control over the sites’ decisions and couldn’t really enforce anything so us removing them was not possible. We did everything we could to convince the site mgmt, of course.
Someone would have to look at and understand the existing code and infrastructure rather than just throwing it all away and writing a data migration. In other words, it would never happen.