I misunderstood the OP originally, but FN posted on IG and clarified this. They're only stopping making/selling the civilian versions they sell in the US, military production is unchanged.
I don't know the MSRP per se, but a taking a quick look on GunBroker the various rifles seem to start at around $3700 and go up from there, which most likely means they were hardly actually selling any. With companies as big as FN, even if something is making profit they often won't deem it worthwhile unless there's really huge volume/money in it. I'd imagine their more 'conventional' 5XX series pistols and the FN15 ARs do a good bit more volume since they're more suited to the American market and much cheaper.
I remember many years ago there was a relatively brief period where they sold semi-only F2000s in the states (called the FS2000 I think), which I believe were made in Belgium then shipped over the pond. But again I'd bet there was very little profit in it comparatively speaking, so they're fairly rare and collectible in the US now.
Does leave me wondering if they'll end up cancelling the likes of the PS90, M249S etc in future.