This is Chesterton's Fence. The problem with any terminal replacement is that you have to support all existing terminal applications. If you don't, then your

This is Chesterton's Fence. The problem with any terminal replacement is that you have to support all existing terminal applications. If you don't, then your replacement is going to be useless for half a century until everything gets re-implemented and installed everywhere (and this is assuming you can get buy-in from everyone on this speculative 50 year investment). If you do, then congratulations, you have all of the legacy terminal baggage.