Gone the same way as the pies in a warming cabinet on the bar and the sausages on cocktail sticks on a hot plate - no longer regarded as proper food by publicans.
I blame it on the demise of work's canteens. Curried eggs, that is one egg cut in half and covered in brown stuff, were a staple. They were a most flexible component of a meal. Equally good whether accompanied by over cooked white rice or soggy warmed up chips. In those pre PC days we were not required or willing to include green stuff with this delicacy.
Decades ago I was very poorly after eating a curried egg. Still not sure that I could face one. I haven't been looking for them but come to think of it, I haven't seen them either. Making your own is probably safest (not the egg bit obviously!).
Peel three onions, cut them in very thin slices, and put
them into a stew-pan with two ounces of fat or butter,
two ounces of chopped bay-leaves, and a sprig of chopped
thyme ; fry these all together for about fifteen minutes till
of a nice golden brown ; then lightly sprinkle in a tablespoon-
full of fine flour, add a teaspoonful of cardamoms, one small
scraped clove of garlic, a saltspoonful of ground allspice,
curry powder, and salt, a pinch of ground ginger, three-
quarters of a pint of any light stock or milk, and boil all
together till the mixture is almost dry. Add to it twelve
sliced hard-boiled eggs, then serve on a hot dish in a border
of plainly boiled rice, garnished with little bunches of hard-
boiled yolk of eggs that have been rubbed through a wire-
sieve, and shredded green capsicums.