I still think, sooner or later it's inevitable that Apple will have more than one model of tablet in its range.
Given the general public have different tastes and different budgets, if you think about it, you are really limiting yourself if you stick with one model forever and letting the other brands clear up with models all around your one and only model.
It would be like Apple selling only 1 model MacBook. Now, you would think that's a crazy idea now.
Perhaps not this year or next, but I'm sure in time you will have a choice.
There is a massive market where even thinking about an iPad for every member of the family (as its not made by apple to be a multi user device) is just crazy due to the high price point.
Do Apple really want families going for other brands?
Apple could in some way relieve the need to do this by accepting that for many families a Tablet device, like a TV would be a single device many in the home may use and allow "user accounts" I know many, even hear have asked for this. To allow say 2 or 3 different people the ability to "log in" to the iPad and have their own apps, email and settings.