Physical Media sales yes are dropping in general but some sections are still doing well as in limited editions
Vinyl Records as another example is having sales increase that's back to 1990 levels
In regards to amount of steelbook collectors in 2012
There is lot more new steelbook collectors now than there was in 2012
A lot of new HDN members in past 2-3 years alone are new to steelbooks and was not purchasing steelbooks in 2012
The reason you see in Europe alone as an example a lot of steelbook re-releases is because of the increase in the number of customers purchasing steelbooks