Where has E gone?

Notice how people often don't pronounce the "e" in words? Seems to be a modern phenomenon. So "weather" becomes "wather", and "terrorist" becomes "tarrorist" They do it with all kinds of e-words. "Banefit", "walcome", "tallyvision" Its amazing! Next time you listen to the news or weather, especially on ITV or commercial radio, see if you notice as wall!