Here are my thoughts:
I don't like the idea of advertising the group as focusing on additional states; however, if a conversation topic leads to Nayarit, Colima, or perhaps Durango (there was a unified zone with Zacatecas in the 1600's) as an offshoot of having ancestry from our original focus area, I would not put a stop to it. There is no point in stopping a conversation that might be helpful to researchers.
For example, I found some of my ancestors from Durango listed in Zacatecas notarial records that were listed on Nuestros Ranchos, but I would not suggest we now include Durango in the Nuestros Ranchos forum. At the same time, I would hope that I would not be stopped if I asked others if they had encountered one of my ancestor's names while researching. I think the key here is to remain flexible without expanding the group too much.
Alice