I am faced with an issue right now working for a small rural WISP. We have roughly 250 wireless customers throughout our area using Ubiquiti radios. Our main fiber drop comes in from a larger ISP on which they provide us several public networks (a /30, a /27, a /24, and some others (including IPv6)). We currently have all of our customers NAT'd through a single public address (which is scary and cannot continue). My end goal is to have every customer radio with its own public address. Our current router is an Ubiquiti EdgeRouter Pro. (The radios are assumed to be running in router mode in this environment)
While exploring many options for a re-design of the network my boss posed a question to me which I simply cannot give a solid answer for.
"Why don't we just throw a switch on the edge of the network and assign the radio IPs statically?" [Thus eliminating the router]
Everything I have learned about networking screams that this is a bad idea. However, I can't give solid reasoning to him as to why it isn't. Any feedback is highly appreciated.
Edit: Our network is behind what appears to be an ISP provided router that we do not have access to. It takes the first IP address in the beginning of our provided ranges.