Over the past fifteen years or so, a tradition has developed that the top three guys in the GC don't race on the last stage unless it is a time trial. And, there seems to be no interest in moving the final time trial to the last day.
I thought this year might create pressure to suspend the "no racing on the last day" tradition, especially if the top three guys ended up within twenty or thirty seconds of each other. But, when the gap between the top riders is a minute, two minutes, three minutes, even the riders consider the race to be over.
However, some years, the sprinters' jersey is still up for grabs going into Paris, and the sprinters will battle it out to the last seconds of the race.