I'd say, given the release of Spire of Dawn, that light elves will flesh-out rather than get rid of Swifthawk agents. Including SoD, there's about 8 or so units (though a few will need multi-part plastics/options). Spireguard/Wardens/Reavers/Chariots/Shadow warriors/Skycutters are all newer kits, so here's hoping.
I am holding out for the Aelf release, hopefully there's one this year.