Personally I wouldn't find that usefull. But I can see why others might. But would you use something like that only for viewing files? Or would it also have to work for saving files? Because I can imagine it would get a bit more complicated then. Since the shell has no knowledge of any http or ftp protocol.
And if it's just for viewing lynx always works for me. A simple command could let you view files with pico though if you really want:
pico ilovelinus.txt; rm -f ilovelinus.txt
That ofcourse wouldn't always be very neat because you might have a ilovelinus.txt already in the current directory. But you could make a nice script out of that and place the files in the /tmp directory each time.
I think it's because scripting is so powerful that things like that never get added to something like a simple shell which is ment to stay simple. It's those gui's that add a bunch of features like that but they never do manage to stay simple and small.