I've done great over the years with my DRIP. I've been using it for over 30 years. I have a lot of profit built in. If it dips I just get more shares at a cheaper price and increase my yield. If you use DRIP you should stay in for no less than five years.
Strong sell? Based on what? If you really believe that why would you even be concerned about DRIP? Just short it if that's your view.
I couldn't imagine this as a strong sell or even a sell. Hold and yes the DRIP is one of the reasons. Also they have a lot of cash and can make a lot of acquisitions or one very big one. Many billions in cash. This isn't VZ with VOD problem after all.