Below is probably the best video of a progressive failure event that has appeared to date. It has been posted on the rts.ch website. This is a landslide that occurred at Riddes in Southwest Switzerland on Friday. It had volume of about 60,000 cubic metres. If the video doesn’t work take a look here:
The block was presumably creeping, generating the collapses at the margins. The event (rockfall) rate noticeably increases before final failure.
It appears to me that there is still a great deal of material to leave this slope.