The longer I do this job the less evil the FD seems. I think we can all agree that we'd like to see EMS evolve into something more analogous to the UK, Australia, and NZ. They have the advantage of national standards, self-governance, and are generally very centralized in that all the systems operate pretty much the same. In the US the chief culprit is that we have a billion different ways EMS is run and almost as many different ways EMS is trained. Even NREMT doesn't adequately represent any sort of average of provider skill, knowledge or scope of practice across the the US. EMS is an amorphous blob of a profession.
This blobishness really gets highlighted when we start talking fire-based vs third service vs hospital-based vs private for profit vs ad nauseam. To say fire departments shouldn't do EMS holds no more ground over saying privates shouldn't do EMS. I have seen horrific examples of all these systems. I've seen great examples of all these systems. It sounds like the OP has a fire-based service that does really well for them and really embraces EMS in its current form. Why try to fix a system that works better than many others? Now if we want to point fingers at the IAFF for holding EMS back we equally have to point our fingers at the multi-state private agencies who are also not lining up to get highly educated, and inevitably expensive, paramedics. Both want short training times for roughly the same reason. If we want EMS to grow then we need to get ourselves together and make it happen, not our employers.
We all need to stop the us vs them we have in EMS. We are very shallow and insecure as a profession in that we constantly judge each other based on the patch on our shoulder not our merits as an individual. Working at a certain place doesn't mystically make you a better or worse provider, nor the vehicle you arrive on scene with.
My only criticism of the OPs system is the number of paramedics. I think any more than two paramedics per patient and you really start running into skill dilution. Not just with intubation but patient interview, scene management, physical exam etc. I think two paramedics is ideal, since with critical patients one paramedic can be overwhelmed and a second paramedic can be helpful to bounce ideas off of and as a check and balance to your work as one person mentioned. But kudos for how well your department has embraced EMS and also keeping your cool amongst a lot of FD criticism. Actually to everyone that has posted for being remarkably civil.