Idea Summary
Define a region once and use it everywhere

Use Case
In many cases we need the same region several times. APEX will force us to copy them here. Changes to logic or layout then will have to be laboriously transferred by hand to regions already copied. For example, this way we could use and include the same card report of say users again and again.

Preferred Solution (Optional)
On the page that is to use the inherited region, you simply create a new region of the type "Subscription / Inherit Region" and specify the application-id, page-id and region-name. Additionally you can pass bind variables of the current page to the query of the "master" region. 
In the master region itself, you can specify via a flag that this region should be inheritable. Additionally you can define aliases for the bind variables.