You can try to stimulate roots with a kelp based product, something like Kelp Max, which works great for me. Otherwise, you might end up with an interesting specimen orchid! I have one with a basal keiki atm, so far no roots on the keiki, but its pretty new.
I had one that was badly dehydrated when it was given to me, the flowerless spike formed a keiki that did grow good roots and is alive and well with my daughter, as the main plant recovered (although slowly). It hasn't bloomed again yet either, though its a large healthy plant now. Maybe I need colder winters to stimulate that one - we've been keeping the house pretty warm for my 90 yr old MIL that lives with us. I'll have to see if I can figure out where its coldest in the house and try to bloom it. I guess it was very free blooming before it got neglected.