I've never grown this Dendrobium, but I would say to give it a little seaweed extract bath and good conditions and new growth will find you. I'd do a mild fungicide dip as well. I won't give up on a sympodial orchid easily. I found a random single Stanhopea backbulb on a shelf in my office that had sprouted a growth and was growing roots. It had to have been there for a couple of months!
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