On average a life form speciates about 3 or 4 times in a million years. I think you have awhile to wait before you will see a fly turn into some other "kind".
"Speciate", the verb of the day! Where's my dictionary! I'll use it in my next pick-up line.
I can't do any sort of double-blind study for three million years ago-- I can't prove you wrong, so you can't prove me wrong, either.
Stalemate.
In which case, I would advise these ersatz prophets of Eternity to tone down their sermonizing.
But, wouldn't you think, since we've been playing with fruit flies for about three hundred years...in Beijing, Detroit, Florence, Terra Fuego...and generations could well be in the hundreds of thousands...all those scientists playing Red Eye , Black Eye, Wingless, Albino with these flies ....
Wouldn't you think we'd at least get a New Fly, if the theory has anything to it at all? It'd sure bolster your religion and its dogma--which may be why so many scientists claim to have Given Life when they clearly have not.