[sambe]

I don't think my estimate of the cost of FTP maintenance would be as high as yours. Why do you think FTP would still be such a cost at this stage?

[asoneth]

I'm curious what your estimate would be.

Mine would be somewhere between 0.5FTE assuming the bare minimum of keep-the-lights-on QA testing for each release and ongoing bug triage up to maybe 3FTE if it requires periodic security and design updates to keep up with changing standards/platforms/protocols.