Yes. Absolutely this: in some sort of platform-wide repositry, in the same
way that Commons does for images.
This is also a real chance to clean up many of the cross-wiki infelicities
that have built up in the old template system.
And coord, citation, and infobox templates are the obvious places to start.
Could probably throw gadgets in the mix too.
Thank you, Derric Atzrott