I don't see MPs as being responsible for the decline in SC business, but the following factors have really hurt SCs:
1) The price of dances: In the golden days of SCs, (mid 90's), full contact lap dances could be had for $10. There were lots of really hot Central and South American girls who were really enthusiastic, (I never felt that way about the Russian and Eastern European ladies. On average, they delivered far less milage). Now a low-contact dance is $20, not including the VIP room charge. Dances are far too expensive. An hour of FS with a decent SP is about half the cost of an hour of SC dances. Once people got used to full contact dances, it became difficult, if not impossible, for them to be satisfied with less.
2) There are almost no younger men going to SCs, and if they do, it's a group of frat boys having one dancer for their whole table, or for the guy who's having a birthday.
3) The smoking ban in public places was a major hit to SCs. I think about 50% of patrons and dancers smoked when I was a SC regular.
4) The quality of the dancers has declined significantly, but the cost of the service has not.
5) DJs who went to the John Gallagher School of Announcing are really annoying.
6) The quality of music, and the length of songs has declined. Lite, MOR music like Celine Dion, Beyoncé, etc. may appeal to the dancer on stage, but the audience sure doesn't like it.
7) Real features are few and far between. There used to be professional travelling features with exotic stage shows. Now it's pretty well minor or washed-up porn stars. One appearance on bangbus seems to be enough to qualify.