That is not happening. Shorts HD is HD only, and it has a carriage agreement, probably for several years. Removing it would be a breach of contract. I know plenty of people seem to hate this channel, but it isn't going to be removed. Not until it's contract expires, and I don't know when that is. Usually, contracts are signed from anywhere between 3 to 10 years, it really depends. 5 years seems to be an average.
As a matter of fact, once HD is added, it probably will not be removed again, unless the channel itself (like G4 or Versus back when) is removed completely.