They're actually not (based on what their site says) not throttling for "periods" of time (meaning 1 month, 2 months, etc). It says it's only during times that the tower you're on is congested. Whether this is all true or not, and in fact they do throttle for one bill cycle, or any number of bill cycles is still yet to be seen. I already know I'm dreading it, as I use more than the 4.7 GB they state, but only buy a few GB's -- most I've used in the 3 years or so I've been with them has been 10 GB and that was when I travelled and streamed Netflix quite a bit.
Well crap, it looks like they either stuck this part in recently, or it was overlooked when they announced it a few months ago..
Once my data speed is reduced, am I going to be under Network Optimization forever?
No. You will be subject to Network Optimization for that billing cycle and the following cycle. When subject to Network Optimization you will only be affected when connected to a cell site experiencing high demand. Otherwise, your data will operate as normal.
Bastards@!