* I'm not either for or against this thing. Don' know enough about it and don't live in the area. Still I think there are questions anyone looking to make such a change should ask. Caveat Emptor and all that.
Some replies to your points and questions:
We are the tax base of EBR.
Sure but that doesn't answer the question. Are there big corporate tax payers in the area? Ascension is full of them (primarily in unincorporated areas I think). Same in St. James. Even with the tax incentives these places get I think they end up putting a big chunk of the taxes. If there are a couple of these in the area that would be a plus (of course the big companies would probably have an opinion on the matter.
So what does it apply to?
The homestead exemption applies to Parishes but not to towns and I'm pretty sure not to cities.
Same way it is now?
How can it work the same way it does now when there is no city there now?
How would it add another layer? WE would have out own council.
Well, unless you plan on seceding from East Baton Rouge Parish, you'd now have Federal, State, Parish and City politicians looking for their share.