[Keith]

I will say there has been wispers of a whoniverse.  With this Disney+ deal this could be the beginging of it. 

Yes, when the return of RTD was announced there seemed to be a suggestion that Doctor Who could develop into more of a franchise, like Marvel & DC, rather than just a standalone BBC show.

In the past they've had spinoffs such as Torchwood and The Sarah Jane Adventures. It's plausible that they might be tempted to try another spinoff, though there might be a question of which company/companies owned the rights. The only frustrating thing is having to wait an entire year for the next set of episodes, as presumably there isn't a Christmas / New Year special.