Probably not. Most alpine valleys were carved by glaciers and have a characteristic U-shaped profile. When you get a landslide into a glacial valley, it hits th

Probably not. Most alpine valleys were carved by glaciers and have a characteristic U-shaped profile. When you get a landslide into a glacial valley, it hits the relatively flat floor and breaks itself apart. The valleys themselves are usually wide enough that they don't dam either. The alps also have significantly less relief than the Himalayas. The valley where the floods occurred in Nepal has a V-shape, and the peaks around it have much more relief. It's much easier for a large landslide to fill the bottom, creating a dam that can burst, or just continue down the valley without wasting all its energy on a broad flat plain at the bottom. The upper valley immediately below the cliff face that toppled was also a glacial U-shaped valley though, so this speculation might need adjustment as more work is done. It's worth emphasizing just how much less monitored and dangerous Nepal's mountains are though. The (greater) Himalayas are unlike any other mountain ranges I've ever seen.