Well the "Urban Fable" has taken place to some extent. Enamels are not going to go away, but they have changed over the years. First they reformulated them to eliminate lead, some of you may not even remember lead based enamels. Most of the lead based enamels were taken off the market in the 70's and 80's. They again reformulated enamels to use "less toxic thinners" in the 80's and 90's, a good example you can see everyday is the number of early 90's automobiles with "skin cancer" (extreme paint wear and fading). California is more strict on this than most (go figure). If you mix the "old formula" enamels with the new thinners it will turn to something the consistantcy of cottage cheese. The thinner enamels that many on the site have commented about are a result of the new formulations.
I have experienced this change first hand, as my step father owned a small Paint shop that serviced the auto and computer industry which had to shutdown, because you just can't use that kind of paint here anymore, without the EPA breathing down your neck every minute, and very expensive enviromental protection filter systems.
No enamels are not going away, but they have and probably will change from time to time.