I threw my "rescue" oncidium noid into the trash today. I bought this orchid 1.5 years ago, back when I didn't know how to distinguish a healthy plant from a dying one. The plant had no roots, and its bulbs were so dehydrated that they were as thin as the leaves themselves. And yet, the orchid had a multitude of thick green leaves, which deceived me as to its health.
Over the past 1.5 years, the orchid failed to produce healthy roots. And little by little the leaves began to die back. Whatever fungal problems were killing off its attempts at new roots, my fungicide treatments failed to thwart it. Most recently, the pseudobulbs and new growths on this orchid turned to rotten mush (and there were no new roots in sight). At this point, while there might have been a minute chance of saving a tiny part of this orchid, it really didn't seem worth it to keep trying.