I've only very rarely heard of the wobble being so bad that the spider had to be euthanized. I've never heard of someone resorting to tube feeding just to keep one alive.
No one can say with 100% certainty what the "wobble" is. It seems to be some kind of neurological deficiency directly connected to the same gene that causes the spider morph. The degrees that it presents itself varies from the mildest extreme...nothing more than faint tilt of the head....to the most severe corkscrewing and inability to control body movements at all. Most spiders fall somewhere between these two extremes, and I'd say the mildest versions are far far more common than the most extreme versions.
The degree that an individual spider shows these signs can also vary. Some babies with more significant wobbles will calm down as they mature and show less signs. Some babies that show no signs as hatchlings may develop more visible signs of it as they grow. It can go either way. Some only show signs when in an excited or agitated state. (Feeding or defensive)
I have a lovely 09 spider with very minimal signs of wobble...just a slight tilt of her head sometimes.
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