Will Android tablets be massively cheaper, will the OS be massively superior, will the number and quality of Android Tablet apps be massively superior.
You imply these things are required, and by a substantial margin (by your using word "massively"). I think that there will be many vendors who will be selling Android tablets, many of which will innovate with hardware in ways are important to consumers.
I can't speak for other users, but in my case I want a tablet that focuses on having a great browsing experience, allowing me to use a bunch of different cloud services. By far, the app I use the most on my iPad is Safari, and iPad Safari browsing experience is pretty weak.
1. No tabbed tab UI. Switching between the different browser "pages" on Safari is a pretty slow process.
2. Authenticating on web pages is rough, especially because I typically use strong passwords and the iOS keyboard makes me switch back and forth between different special character screens to enter my passwords. At least let me have a numeric row.
3. Due to the keyboard weakness mentioned above, the fact that Safari has no support for remembering passwords is particularly frustrating. Maybe it would make sense to allow 3rd party keyboard "apps".
4. Support browser extensions and Flash.
5. Don't require me to use iTunes as it is a horrible piece of bloated software. Let the device update itself (like Android, webOS, etc) and not be tied to a particular PC/Mac.
6. Higher resolution display.
7. Proper multitasking UI. I like the webOS metaphor. Copy that.
If a tablet vendor did a better job at at the browsing experience, they will be able to sell me my next tablet. Unfortunately, Apple doesn't seem to care as much about the web. They seem to be focused on selling apps on the app store.
Fortunately for Google, HP and RIM, Apple seems to be setting the bar pretty low in this area. So I hope that they can do better. Massively better.