I predict the Lisp Machine will return, with Android OS Clojure hacking as its embryonic beginning of life.
http://www.sts.tu-harburg.de/~r.f.moeller/symbolics-info/dev...
http://www.sts.tu-harburg.de/~r.f.moeller/symbolics-info/doc...
The Android OS is not written in Lisp. The turtles do not go all the way down. Therefore it is not and will never be a Lisp Machine in any reasonable sense.