Well, LaTeX is also Turing complete, so I wonder why has no-one tried programming a terminal in it. It would be fun to install 1GB of TeX packages to be able to open a terminal.
What's the point of using hypertext-(web)-standard-oriented multimedia-capable framework to create an application that just shows plain text (ok, plain text + 16 colors + bold).
Why would one package a 50MB terminal, packing stuff that will never be needed in a terminal.
It would make sense if they were to spend all that effort to create a terminal-based web browser.