It's hard to tell on the satellite timelapse imagery, but overall you can visually tell that snow amounts have declined in the area. However, the very point where this cave is located still looks like a hole to me as of 1984.
Open a new browser window and open these two links into separate tabs and cycle through them fast until you get oriented. Not sure what conclusions you might draw from it. It's only 34 years' worth, but hmm.