I think that a lot of people, wanted to see how the iPad fared in the public intro. When they do stock the the 3G models, odds are good that a large number of people will pop up to buy one.
I am looking for a 64GB + 3G unit myself. I don't think that there will be mob flood gate mentality that took place on 4.03.10. I will just stroll into a local Apple store - not the one in downtown Boston, probably the legacy place location in Dedham, MA. and get one.
Pre-condition - Apple addresses current WiFi issue