Such is the layout of Nemesis and the speed at which the train travels around the track, the track and supports have got to be subject to lot of stresses, more so than the average coaster.
Plus Nemesis is outside so it has to deal with the elements.
I wish Nemesis would stay at AT forever, but we all know it will only be there until maintaining it costs more than it's worth. I hope it it's around for a long time to come yet, WAY more than a decade!.. but hey, I've got now say in it.
BTW- That support that has been removed from the loop- does anyone want take a stab at what exactly they do with it? Is it cleaned of rust/painted and then re-instated, or will they replace it altogether?