Firstly, I agree that today's decision was the only one possible.
The TdF website is suggesting that tomorrow's stage has been drastically altered already by the ASO.
Originally, the stage was to be 135Km taking in 3 categorized climbs with total climbing of around 4500m and a couple of technical descents (off the Cormet de Reseland and Notre Dame du Pre).
The reports here are now saying the stage will start at 2.30pm (local) and ride directly 25Km along the N90 to Moutiers and then make the 35km climb to Val Thorens. So basically a 35km, 2500m sprint to VT!