We'd missed this before, and it was mentioned at the LAFCO meeting in September. With the boundaries as currently imagined, there is a slight overlap between SRV Fire and Contra Costa County Fire. As reported in Craig's semi-official SRVFire blog, it might be best if there were a realignment of service boundaries as well.
At the LAFCO meeting, it was pointed out that this need not be done at the same time as the incorporation, and many towns and cities do survive with multiple service providers. It's not fatal to the proposal, just something that would need to be worked out, said the LAFCO commisioners.