While I can well understand Prince’s desire to revert to an earlier form of music distribution and the control over that distribution that entailed, those days aren’t *ever* coming back.
While Prince is definitely interested in exerting control over his music, and extracting a well deserved value from it, his response to your doubtless sensible and relevant suggestions seems naïve to the point of perverse — you can’t uninvent digital music piracy; you have to make it irrelevant through better ways for people to access and pay for music.
If that means giving up some notional “control” over that distribution, so be it.
That, or simply stop monetising the distribution of music — by giving it away for free, or simply not distributing it at all.
A really smart and savvy businessman would recognise the reality of the situation, and seek to leverage it to their benefit — and I’m really not sure that’s what Prince is doing here — he seems rather more interested in having complete control of his musical output irrespective of the commercial impact of that control.
That’s a perfectly legitimate artistic and personal choice, but its really not a smart business move in today’s music business landscape.