It's just a fact of life that whenever something, whether it's a car or an iPod, comes along as a new version, the older version becomes obsolete. The same goes with electronics in trains.
Most people I see seem to upgrade older trains with new sounds and control. Others, including myself, try to hold onto the original sounds as long as possible for nostalgia or preference.
Though I'm very concerned how these older electronics will hold up 50 years from now, or longer. Will they all eventually break and stop working? I know plenty of things do, like VCR's, but I have had quite a few TV's that held up for 20 years or so working relatively alright.
I have numerous Lionel engines with RailSounds 1.0 and 2 that are already 20 years old or more. I've only had to replace one RS1.0 board in my experience, and I happened to have an exact replacement fortunately from a good friend who was updating one of his RS1.0 engines. These engines, along with ones having everything from Mighty Sound of Steam to Proto 1.0, may eventually stop working at all overtime, but of course with the continually improving electronics, manufacturers won't supply for the older technology.
Am I the only one who worries about this in the back of the mind?