I am not sure the two are directly related - in fact I would say that they have nothing to do with one another. No more than having Trump as US president also coincides with the decrease of Bigfoot sightings.
Bigfoot (we are assuming for the sake of this discussion they exist) are likely nocturnal creatures. Since most mobile phone cameras are complete nutse in low light situations, then I wouldn't expect to get a clear shot of them at the best of times in the evening or night situations.
I would argue that the lack of any decent sightings is likely due to the nut-jobs on the television causing people to venture out into the bush, and quite literally scare Bigfoot away from what would be their normal habitat and pushing them further and deeper into the forest. By doing so, they are less likely to be seen crossing roads due to their remote locations.
Or of course, it could very well be that the UFOs have come and picked them all up as their 3 hour tour was over.
It is a 50/50 split ...
-One step, two step, three step ... Wait, I don't have size 26 feet?-