So you just read a Wikipedia article and suddenly promote up to the top of networking gurus...
However, I'm sorry to tell you, you are as wrong as you could be.
- There IS throttling issues by ISP (I don't know why you're assuming only one problem can exist, maybe you don't have this issue, but many people is suffering from that - fortunately not me)
- The biggest problems at the moment are from game design (from, mostly, a networking point of view)
- Server congestion will deteriorate quality of service, yes, this is probably happening right now, could be, but I doubt so, and if it is happening, it is heavily eclipsed by the other issues
