Would is a big question, as FN pretty much always charges a premium, but could they? Yes they could. KelTec doesn't have a fraction of the manufacturing capability of FN, and the RDB, which has more metal parts then the FS2K, is now selling for around $1,100 on Gunbroker.
The FS2000 (excluding the R&D and tooling startup costs) is simply not that expensive to produce.
A fairly simple bolt assembly:
And a pretty straightforward pencil barrel:
Then add pins, springs, screws, and a aluminum top rail, and that's about it for metal parts.
The rest are Jizzed out glass reinforced nylon parts.
Glocks cost between $65-$125 to manufacture. You can buy cheap AR15's for $400-$500 RETAIL, which are all machined. I would not be surprised if FN's cost of manufacturing the FS2000 (not counting upfront R&D and tooling costs) is around $300.
How many FS2000's were sold when they cost $1600? 5,000? 10,000 at most? The Tavor has sold over 40,000 (making it the most popular bullpup ever by overall sales in the US.) Given the rarity of finding FS2K's in the wild, I have to assume not that many were sold.
So lets say 10K units at $1600 = $16 Million in sales in the US.
Now at $1000, fully $600 less then a Tavor and $700 less then an AUG.... redesign it to accept P-MAGS and you could have something that would outsell the Tavor.
50K units sold @ $1,000 = $50 Million in sales in the US.
Given FN's size, near vertical integration, and strong US manufacturing presence, there's no reason they couldn't play hardball in the US bullpup market and undercut everyone with $1,000 space gats.