Tablets are primarily consumption devices, the user can consume various forms of information and entertainment. On screen keyboards are fine for basic uses, but not for longer periods of work. Luckily Bluetooth keyboards exist for most tablets.
However a netbook (especially a decent AMD based one) is actually far more useful if you are going to be doing anything more involved that consuming data and giving trivial input.
Both can co-exist in a household.
I think it's been around a decade since someone first suggested ARM as a possible AmigaOS target. A port back then could have led to AmigaOS being a major player in the tablet space by now. Too late now.
As for Natami, the team had a meltdown and they all went off to do their own thing. The NatAmi head person, Thomas, decided he wanted to do ALL of the work by himself for some personal achievement reasons. As far as I'm concerned it's pretty much dead, at least for the foreseeable future. FPGAArcade is the best bet right now.