Its up to us to attend a park, so they can actually give us a reason to want to go later? I think you have that backwards personally.
My point is, looking at it from the business side of the equation: the higher the attendence, the higher the rate of new rides. Just because attendence is low, doesn't mean a park should be neglected, and SFA isn't neglected, as Thomas Town has showed.
However, there is a difference between nice, small additions, and massive coasters. The first is easy to build and, as we saw this year, allows parks to re-locate things and rework the park, while still being able to advertise the entire thing as "new rides".
Bottom line is that SFA will continue to see improvements and additions to the park. However, until the atendence justifies anything further, additions will be few and far between.
I agree with your general premise. And I definitely don't think that SFA as it stands right now merits or could justify receiving massive, new additions season after season. Thomas Town was a nice addition to the park, especially considering how few and far between such additions have been for the past decade. I hope that the trend continues and more is added for the 2012 season (since all signs point to 2011 being an off year as far as new stuff goes). A nice moderate sized coaster would work great. I don't think in this region it is fair to the park to simply say the attendance isn't there now, so they shouldn't get receive anything. People need to have a reason to want to visit the park, or they'll just go somewhere else where they have new attractions every season or two - plenty of choices within a couple/few hours. SFA spent a lot of time building a better infrastructure for the park, I think now they are in a good position to start adding new attractions again.