I would be interested in a Swift port for Linux server-side/command line dev. Not so much client UI dev. Swift on Linux servers could help Apple sell more Macbooks to developers.
And Microsoft puts money on F#, Haskell and OCaml, all of which already have better Linux support.
Swift is great for pushing functional programming down the throat to mainstream developers that wish to target iOS, but it is no more pragmatic than OCaml or F#.
For the OP use case, targeting Linux server software is already better served by the languages I mentioned.
If Apple decides/realizes Swift was a bad idea, you will be out of luck with your codebase. Unlike open source where users can continue the work of the corporation.
It would enable porting to other platforms, and it's also just useful to be able to look at how things implemented. I've benefitted a lot from being able to look at the Objective-C runtime source code, for example, because I can see how things work or where things go wrong.
I would be interested in a Swift port for Linux server-side/command line dev. Not so much client UI dev. Swift on Linux servers could help Apple sell more Macbooks to developers.