I personally don't think that the netbook is dead whatsoever.
For proper use a netbook is leagues better than using a tablet, purely having the keyboard makes working on them much easier for anything other than browsing the web or streaming video. The netbook was for a niche market originally, not as desktop replacement as some end users are trying to use them as and seeing them as 'crap' and moving on to the next fad.
Tablets, although nice and pretty, for the majority of things are just clumsy and illogical compared to the keyboard. The only thing lacking for many is the poor resolution on screens (although you do get some decent resolutions, you'd be as well as buying a laptop for the price) and the price ( Many are priced similarly to laptops, which for many is a better choice)
The netbook is meant to be a cheap, portable station for you to use and for that, it still fits the bill perfectly. Although since the netbook hit mass popularity with the general public the quality has been dwindling and the use of HDD over SSD has become a lot more prevalent which is certainly a worse choice, people see the larger amount of storage and automatically assume it's better although then SSD is a lot more practical in portable system.
For what tablets are trying to be for many (A replacement for netbooks) they just aren't anywhere near yet. They are more or less as powerful, have less storage, and most likely have to be tethered to some sort of plan to be able to access the internet. For the price, they are far from practical and the only real reason I can personally see for buying one at this moment in time is
a) You have disposable income and wish to use it for watching movies/casual web browsing
b) Everyone else has one so they must be good
c) You have some specific work use for them
For the price, netbooks are very good, although resolution + HDD could be sorted.
Tablets are just too expensive to be a sensible replacement for a netobok.