I think one can understand TT wanted to be secure, but to fail to understand that Teamviewer is an essential tool for many customers is a sign of management that are incompetent from an IT point of view. And to make that sort of change without warning is not just upsetting but could be potentially dangerous, exactly the opposite of their intention. In my case it left exposed at least one machine which was not able to be updated any other way than remotely.
The moral for TT is to understand their customers. Why has no other ISP banned TeamViewer - there have been similar attacks. Most of these attacks rely upon computer illiteracy, similar perhaps to the TT management. The solution is easy. Make the Teamviewer IP addresses/application only available by opting in and with an appropriate warning. It will of course not completely solve the problem, but at least TT would be able to feel they had done something.
Biting the hand that feeds IT
