The revenge of the monster Dendrobium

[The3birds]

This Dendrobium has been in this 6" pot for at least 6 years (did I just hear a big gasp?). I have never change the medium (none left). My husband thinks I should divide it, but it is 4' tall and 4' wide and I have little hope I can get it to stand up without major scaffolding. I don't plan on doing anything to it unless it stops blooming which it hasn't in the last 3 years. I always have flowers.