Yup. The demand is for iPads. There was never any significant demand for 'computing tablets' in general so other companies are trying to hijack the hype and redirect the demand for iPads towards their devices.
That really is a good point. For ten years Microsoft partnered with hardware vendors to sell tablets, and for ten years they never could get the general public interested in tablets.
The iPad comes along and suddenly everyone wants an iPad, but the same dimwits that thought they could sell tablets before now suddenly think the general public finally wants what they are selling. They don't. They want iPads.
This may change eventually, but to get an iPad user to switch, you have to make something a) better and/or b) cheaper with c) a better ecosystem. Good luck with that.