Having a bucketload of high mountain stages in a stage race like the Tour de Suisse is fine. It's a hugely mountainous country and it's a historic race so you want it to be hard to win. There are two fundamental problems here, however.
1) the Tour de Suisse is not a week-race à la Tirreno or Paris-Nice, where the climbs should be more along the lines of muritos and medium-mountain terrain; look at a relief map of Switzerland and recognize this race takes place in June - they can produce some proper mountain stages to rival any Grand Tour. The problem is not that they have three consecutive high mountain stages; the 2009 Dauphiné did that with Ventoux, then Vars & Izoard, then the Saint-François-Lonchamp MTF. The problem is that the three consecutive high mountain stages they have produced are terrible.
2) if you ARE going to go the "petit-Grand-Tour" route of parcours design with full on high mountain stages, then you've got to balance the parcours. The TT should be long enough that the climbers have to attack for their wins, otherwise they've no need to wait until 1500m to go and it all gets very tame. A normal TdS TT is around 30-35km, but with well designed mountain stages a one week stage race can justify near 50k ITTs - take the 2010 Dauphiné for example. The 17km ITT here is a pathetic distance, to match the very poorly designed mountain stages. They've overstepped the mark on TTs in these one-week races, for example the 2009 Tour de Suisse and the 2012 Dauphiné, but those weren't so much that the TTs were necessarily too long, but that the TTs were too long for balance with the mountain stages they'd included. This is redressing the balance too far the other way.
I love the Rettenbachferner, but this is NOT the way to introduce it, plus it will kill the stages before that finish. Then the Rettenbachferner will be a survival climb, we get too short an ITT. The biggest hope is that some strong climbers have a deficit and need to go from afar in the Davos stage on Flüelapass, but with the TT being so short they probably won't lose the jersey to a stronger TTer the next day, or won't need much time so won't need to take risks.