The PSP has been slowly but surely selling in decent numbers....okay compared to the DS it is night and day, but if you consider the PSP has been virtually double the price of the DS since it's release and only now is getting closer to the same price level...the PSP has done well.
The pricecut will probably help with the sales of PSP over the next few months through the summer until the big games get released.
Dec 05 - Mar 06: 1.2m, 208k, 202k, 203k
Apr 06 - July 06: 195k, 194k, 234k, 170k
Aug 06 - Nov 06: 155k, 170k, 138k, 437k
Dec 06 - Mar 07: 1m, 256k, 189k, ????
As you can see, the sales from early this year are not too dissimilar to last year...although are slightly down. Although I reckon with the release of more better games, and a more affortable price level, we could see an increase in sales over the next 3-4 months....I think we'll see an increase of around 10-15% in sales over the forthcoming months.
Prediction (June 12th 2017)
Permanent pricedrop for both PS4 Slim and PS4 Pro in October.
PS4 Slim $249 (October 2017)
PS4 Pro $349 (October 2017)
Essay Pro