Same here- my tab 10.1 is great for portability and battery life. But I hate typing out emails and things like that on it. I have the S3 and the screen size is 4.8"- the note 2 is 5.5". I think by the time I upgrade, phones with a 6" screen will be the new thing- and at that point, I wonder if buying a 7" tablet is worth it at all.
I too wonder if Google will scrap support for it- they are giving away so much with the chromebooks and reeks of a bit of desperation. As one article stated- the 12 free gogo passes are worth $150 and the 100GB of google drive space for 2yrs is $119.76. So basically you're getting $260 worth of services for $250. And you get the actual chromebook. But I'm not complaining.
You can say the same thing about lack of support with Android- most hardware outside of rooting is good for 1 official update, and at that point you're "cut off" by Google. If you want the 2nd major OS update since you bought your device, you're options are to buy a new device or root. So even if Google dumps ChromeOS, it's still open-source and builds can be supported outside of official support.
For $80 more, you get the Verizon 3G version with free 100MBs of data per month. OK, it's not LTE and it's only 100MB, but you can't complain with a one time fee of $80.
Anyways, I'm glad I have all these choices- it will be interesting to see how chromeOS plays out. These Android tablets are only going to get more advanced and sophisticated and eventually really be a competitor to ChromeOS.