Hmph... luckily, I haven't been forced back to Dialup, but I had to give up Cable a while back. Honestly, I don't miss it. My DSL has actually been better for gaming than cable was, even with the reduction in bandwidth.
What did it for me is actually a bit unusual - most people wouldn't care. No cable provider in my area offered a restriction-free connection with a static IP. Hence, I could get Adelphia, but I could not run Apache on it easily (blocked port 80)... nor could I guarantee that the IP I had one day would be the IP I'll have tomorrow. I could request those things, however, with DSL. Hence, I moved over.
Almost got into a fight with my cable company:
"Yeah, we stopped blocking port 80, you can come back now. Have a month free."
"Ok, sounds good... Hey, you're blocking port 80! I came back because you said you stopped!"
"Oops, someone lied. Just unhook your connection, drive to our nearest (1 hour drive) facility and drop off the equipment." (luckily, I still had my DSL service, so I didn't lose my internet connection)
"grumble grumble... OK, I'm outta here. I expect there won't be a bill, and I won't be coming back"
"OK, sir."
And I don't think I'll try again. I don't like being lied to.