Downgrading to TV only...

I currently have TV/Internet/Voice.  TV service is great, with the exception of having to use Component connection due to Black crush issue with HDMI. Internet however.... as reliable as warm weather in the northeast!

My question is, when I remove internet and voice from my account, will I keep the NVG589 or will I get a different gateway that does not have to use 2 pair wiring?