Even more out of office than normal so maybe I don't have the throughput to process this but it sounds like it won't work then. If the new types aren't going to be loaded than we cannot evolve the datatypes with new functionality in new repositories. 

Perhaps I am missing something,  but in the abstract it seems Galaxy would have no way of knowing which types are new and which types are old in this scenario.

Not really my business so feel free to proceed however obviously - just letting you know that it makes me nervous. I will try to find the time to understand how the tool shed handles data types so I can speak with less ignorance in the future.

-John