See, like... the problem that I'm having with wrapping my head around this is... what sort of 'new advanced things' are we talking about?
It's a MU. It's, fundamentally, text manipulation and basic math. I mean, yes, you have some more advanced options in the form of selecting how text appears and who it goes to, etc, but no matter how advanced and shiny you make it, the fundamental things you need are some way to print entered text, and some way to manipulate numbers.
Some of the suggestions made just seem like adding features simply for the sake of adding features, even if they don't actually improve upon anything. Sort of like this idea of buttons for all the commands. What does that accomplish that your welcome screen on a mush can't? 'Hi player, we assume you're new, here's what you need to get started.'
I mean, think of your most commonly used things. Pose, Say, Emit. The only things they do, literally, is change how the thing sent to the room you're in starts, and of course they can trigger certain side-effects with advanced foo (that no one ever uses). But even if you have a button for all three of those, seriously, how would it even be used? Do you hit the button and then type what you want to send, and hit enter? Do you type what you want to send and then hit the button to do it? Even the 'get' thing earlier, if you know what you're wanting to get, why do you need a button that does it?
Sure, you can throw some fancy things in with all the things we've done in the last few decades. You can watch dice roll across the screen with nifty graphics, and maybe throw some rich text in there (god help us all, it'll be Papyrus and Comic Sans just splattered all over the place...)
Yes, we've made lots of advances, but how advanced does it really need to be to do something that's essentially a glorified skype window with an internal calculator?