update tv box needed?

Yesterday I went into On-Demand and there was a message:   "In upcoming weeks 1 or more TV boxes in your home will no longer allow you to access Xfinity On-Demand packages.  To continue access we're updating your TV to X1 with new equipment".

Really?  How many upcoming weeks?  What if we don't want X1?  We have 1 Smart TV, and 1 SD TV.  Our understanding is that X1 is not truly compatible with an SD TV.  If we're forced to update to X1 in order to keep On-Demand, we'll either have to replace the SD TV or ditch it.  And, who is going to set up the new equipment?  Not us!