Just because only 1000 people answered doesn't mean there's only 1000 boards/users left. My father has 2 boards that he hasn't registered. There have to be other users out there who haven't heard of the survey or just aren't filling it out. Plus it's only been going 2 months. If you want accurate survey data, that's not enough time, especially for one that users need to discover on their own.
And? Do you think even if 1000 users were left that all will buy OS4? Will your dad buy 2 copies because he has 2 cards? He was also talking of thousands. If there are thousands of users left were have they all gone? Why does the software sell doing that bad? Well, we will see if there are much more users outthere in 4 months. I doubt that. The amiga market is very tiny these days.