What ever happened to the TV mini-series?

I remember in the mid 90’s all the way on through the early years of this millennium, it seems like the big three TV networks were always making heavily-hyped, multi-part movies, which were usually shown during the May sweeps period. But now, it seems like that trend has died out, as I can’t recall seeing any ads or promos for any new mini-series. Granted, I don’t watch nearly as much TV (or, to be more specific, programs on TV (I still watch plenty of DVD’s)), as I did back in those days, but it still seems to me like the TV mini-series (at least on the three major networks) has become extinct. Does anyone know why?