Agreed! It is disappointing to lose some very good songs by very popular artists. I checked the other day and saw that most of the BB King songs had gone. Real shame for me. 

However, I keep finding songs I am interested in learning, so disappointing, but not terminally so.

I think some people have unrealistic expectations of the number of new songs that could be introduced. I imagine it's quite a body of work to negotiate the rights, in some cases transcribe the notation, learn the song to expert level, break it down into bite sized chunks for teaching, and publish various play-along versions.

I think we are lucky if we get 2 new songs per week.

Alf