To answer that question, we would need a definiton of the word template which has quite a few meanings.
Consider a given layout that has to be ensured, for some thesis requirements or a corporate design. Implementing everything in a package or class and providing this is certainly licensable. Many such packages and classes are on CTAN, many Journals have own classes with a special license.
If a template as a bundle comes with a class file, and an example tex-file; are all files bound to the same license? See next section for more.
There is no own package involved, the template simply is a couple of commonly used packages. Which packages to use was chosen by the person originally putting together the template.
%the following is cc by-sa 3.0 with attribution required
I've been watchin birds more than insects recently,
and the thing I've found with pigeons is: they've
got wings but they walk a lot. (Karl Pilkington)
Some other text
Is that mere example topic of licensing? If so, is changing the document body immediately a derived work?
These are more questions than answers, feel free to read more about my Template Confusion.