This seems like a good feature for those with a lot of profiles.
Here are some options:
(1) Build a client-side script to poll your set of utag.js files out there and return the version
(2) Contact your AM to have us run the report server-side (this is done.) :-)
For doing "mass updates" of tag templates, we also have two options:
(1) Writing a script to login to each account and remove the template. This shouldn't be too difficult, but you would have to leave your browser open while it does the work.
(2) For a really large account (i.e. 100 profiles) we could submit a ticket to our DevOps team to do server-side template removal.