The problem with theorising about what removing ammo racks and regen might mean is that it’s already been done (RTCW) and the things that people fear may happen, didn’t. As long as you move around the map as a squad, which contains a Medic and a F/Op, you should never run out of ammo or health. The current mechanics allow you not to do that, and is the single biggest obstacle to team-work in DB at the moment, IMHO.
The point about Sniper, and how a F/Ops on the front line would re-supply him, is fairly moot. How does an ammo rack no-where near the Sniper’s location re-supply him?