As I've commented elsewhere, the 'rapid decline' in the netbook market is sales-pitch hyperbole for 'nobody's needed to buy a new netbook' yet.
Standard netbooks will suit 75-85% of users while running stock XP and 1GB ram - and are probably still going to suit netbook consumers for a few more years yet. Tablets have glimmer appeal (as in for people who are inspired by shiny things), but in a short time appear to have little use further than replacing the magazines in the toilet with a more technologically updated version of the same.
Netbook makers are now in a different manufacturing epoch, and could adapt to manufacture-on-demand styles such as the dell model, but it would be unwise to suggest consumers are champing at the bit to upgrade their existing netbook for a new one with arguably similar specifications until there is a new technological breakthrough to add to the mix - even a minor shift such as 22 hour battery life or touchscreens would hardly move the masses though, but would likely be limited to the curious.
My personal pick will be that we see netbooks endure for a few more years until most consumers are naturally considering picking up a replacement anyway. This 'resurgence' in netbooks will simply be more sales hyperbole attempting to work out how netbook sales are attributed to them, rather than average joe's replacing like for like.
I'd like to consider what those netbooks will be like though (read this as industry goals, not in any priority order):
1. Sub $200-300
2. 1TB SSD
3. 4GB ram
4. 3D graphics engines comparable to todays gaming machines
5. 10'-11' screen size (achieved)
7. 20-24hr battery life
I want to see a small netbook like 7 or 8 inches again. Why not a large screen smart phone or a small screen net book that would fit in a purse or military dungaree pocket? Maybe a folding or dual screen contraption? Touch typing, virtual keyboard, thumb typing? I am not sure what to want in that respect. I suppose it depends on the applications and the way they are presented.