That's what they did to one tower covering Rutherford College just west of a midsize city with full HSPA coverage..
This is in Western NC and while they upgraded all of this when the city got "4G" coverage you can see they weren't very complete.
That 2G spot inbetween the 3G/4G shades of colors there is one little tower along that interstate that is still running EDGE. So coming in from the right (East to West) I have 4G drop down to EDGE for about half a mile then back up to 4G... pretty ridiculous to leave one tower like that. Not to mention the rest of the EDGE towers as you keep going West but won't get into that.