I don't understand this spaghetti wall argument everyone here is throwing around. So what if Samsung abandons the tablet market tomorrow? Android is still there. You still have your tablet. It will work until you are ready to update. The only change is that you won't get to enjoy the next iteration in their product line. No real loss. Certainly no evil repercussions for customers.
I don't think you understand how Android works, Google can release update after update to Android but it is up to both the manufacturer and the carrier (for 3G models) to make it available for each of their models so with Samsung releasing so many models (and I'm talking from personal experience here) they are often slow to release updates or even critical fixes, the problems with the Samsung Galaxy S on AT&T for obe example were just ridiculous, there is no way Apple would ever let that happen to one of their iPhones for that long.
Sure hackers can compile the latest versions of Android once Google releases the source for various handsets but that is often by using older proprietary binary drivers so it isn't the ideal experience.