If you look at the type of Cat in the Super Ten's pipe, you'll see it's not going to deteriorate like a honeycomb brick style can. We have people with over 200k on their S10s w/o any cat issues. I think you would have to abuse it intentionally to have an issue.
It was just a consideration as cats tend to be overlooked, the Tenere cats a pretty compact from what I've seen...and seem to be a little constrictive, over fueling is a problem and will kill a cat, but the Tenere's seem lean anyway...I'm removing mine for the the only reason as to have the less restricted exhaust, remember reading a member here cut one out and modified the rear on a standard exhaust and made nice gains....not super gains, but noticeable.. I have 75k's on mine which is pretty moderate k's for these bikes....
Most of the people that removed cats did it at relatively low mileage. The pics I saw all showed them in great condition. What do you consider "high mileage" on your Super Ten? It may not be what others consider high mileage.