The simple solution is have more interesting parcours.
Might be a good idea for stages like this to have TV coverage to see the action with riders trying to get in the break. Go off air for a period and time the commence of the coverage for about 50-60kms to go. Pointless having 120-130kms of coverage when nothing will happen for the most part. The break is already formed.
If anything this boredom will drive any potential fan away from the sport.
The main entertainment before the last ten minutes of each stage so far has come from guessing (a) which Bora rider or riders will be in the break and (b) at what km Morkov and/or Bennett will get dropped by the peloton.