I don't think that tablets will replace netbooks in the near term.
I have a Asus EEE 1000HE with a 9.5 hour battery life (reality=6hours), 320GB 7200rpm drive, 2GB RAM, Atom N280, 10.1" screen, Windows 7 HP.
The only things that I would like is a 1366*768 screen (is available in new ASUS Eee PC 1005PR-PU17), and maybe built-in 3G, but a USB dongle is OK. My netbook only has 2.4GHz N wifi, would like 5GHz N wifi. I may just upgrade the wifi card.
In the short term the tablets can't compete, but we will see what new technology brings.
My netbook runs MS Office 2007, CS4, video ripping, editing, etc, etc. Sometimes a bit slow, but the convenience is great - it goes everywhere I go.