Android phones had a captive market.
iPads are more useful, cheaper and not limited by carrier. Why would a non-enthusiast buy an Android tablet based on the idea they they might get better over time, when iPads are good now?
The same way that people bought Android phones when it first came out. Not everybody wants Apple.
Now, Android phones are genuinely competitive with the iPhone, but they got there because they had real advantages in availability and price from day one. Android tablets don't have those advantages.
There are a lot of people who prefer other products over Apple's in the same way that there are still a lot of people who still prefer a feature phone over a smartphone.
Ok - so I was off by 4% - 24% of people pick non-Apple mp3 players.
So what's your point again?
Why did anyone buy an iPad when they came out? There were no iPad specific apps when it came out, and yet it sold well.
Clearly, Android has a good web browser and email client, and that's enough for many. Just as clearly there are a huge number of non-tablet specific apps that will run fine on the Android tablets, and Android developers are desperately releasing tablet apps as fast as they can to try and take advantage of the "gold rush" when a new platform launches.
New platforms don't automatically lead to a gold rush. There hasn't been one for the palm pre.
The argument you are making is that normal consumers will pick a more expensive android tablet with very few apps over an iPad 2 with thousands of apps, some of then mind-blowing on the basis that there will surely be a developer gold-rush.
Even if there is a developer gold-rush, people will still have to wait a year for then software to be written.
I can see enthusiasts doing that by but why on earth would a regular consumer?
Compare the Android phones, where you get HTC Desires for free, on 12 or 18-month contracts with monthly charges in the £20s.
Apple has a big price problem competing in the UK in phones. It gets away with $1:£1 in computing, just, but it won't when Android is "good enough".