Tetra should include a thermal alarm tag on the bottle that indicates if the temperature range was exceeded.
Most hospital quality microbiology medias and reagents actually have these alarms systems. As well as reagents for other parts of the hospital. We have had quite a few in my line of work that had to be sent back to the company due to these temperature tanges being exceeded. The problem is though, the cost to do that would outweigh the worth of the product, so unfortunately the likeleyhood of a Bacteria-in-a-bottle company doing it would be non-existant.
At $13 for a tiny bottle, I think that it could be accomplished without adding excessive cost especially by just placing the tag on a carton of product. As for the viability of the company, it seems to me that their reputation would benefit greatly by the labeling (actually protection) since it would remove this "great unknown" about the product. It could be shipped just like any other perishable product putting the burden on the shipper to get it there without ruining it.
So far, in my personal experience, it has been a great product. I never suffered an ammonia or nitrIte spike when using it, even when overloading a new tank. It's not cheap, but neither are nice fish, other start-up costs, or worrying. A bag of gravel costs more than a bottle of TSS. Plus, I don't want to wait for weeks hoping and praying that the cycle will work, I want to spend the majority of my effort into raising fish not bacteria. ;-)
Don't get me wrong, I understand the hidden importance of putting new aquarists thru this procedure. It gives them time to learn about the nitrogen cycle and fish keeping in general without killing fish needlessly and without flooding the boards with "whats wrong with my fish" any more than they already are. But if you just want to start a new tank easily or end a mini-cycle dead in its tracks, TSS is something to consider.