Moon,
I'd guess there's still training capacity available to produce F/Es. A look at Pan Am Academy's website, for example, shows a number of sims for airplanes requiring an F/E. And there are still a couple of freight companies here operating B727s. The occasional DC8 or L1011 appears. While not around in significant numbers, and we don't hear much about it, F/E spots exist; The market ALWAYS provides !
I have a dim recollection of hearing that SWA trained up a number of their mechanics for the B727 F/E spots during that experimental phase of their history. Don't bet the grocery money on that but it's what I recall.