I've been getting keikis from dends several times, getting keikis and flower spikes from the same cane, sometimes the cane doesn't have leaves just the keiki, and sometimes the cane is full of leaves, with flowers spikes and with a keiki, and I cut off the keiki and plant it and wait its grow. The keiki's canes are healthy and the next year they're getting flowers spikes. Hope this can help you.
Alma

Dendrobiums form keikis for reasons other than excess nitrogen, specifically watering and fertilizing at the wrong times. If the keiki is coming from the base of the cane, then that's where it should be coming from. But if it's coming from higher up on the cane, then look to your culture. Cut back fertilizing at the end of August, and ease off your watering gradually in the month of September. These plants need less water and fertilizer in the darker months.

Some dends like Emma White also tend to throw up far more keikis than others. I personally dont bother myself about it too much as long as the plant is healthy and has no problems blooming as usual.

Your plant is probably a Dendrobium phaelaenopsis hybrid ( I prefer D. bigibbum as the name is confusing) not Den x Phal, which would be a cross between two incompatible species. Dendrobium phalaenopsis means "the phalaenopsis- like Dendrobium". Actually it's not that similar. Agree with other comments.

You mean there's no dendrobium x phalaenopsis hybrids then? So, there's only the D. phalaenopsis which is conspecific to D. bigibbum, which are differentiated from D. nobile and other dend species for having only terminal flower spikes, and the resemblance of the flowers and leaves to phals?