Just let me download a DRM-free file. That way I can play it offline on my preferred media device. If I decide to rewatch it a few days later, I don't have to worry about wasting extra bandwidth.
I don't mind paying for content and services. I'm fully cognizant of the reality that things cost money. But when the content isn't being provided through a fair medium, or the service sucks... People will go through other means.
Since I enjoy anime, I have paid subscriptions for both Crunchyroll and Funimation. Despite paying for their services, I always find it more convenient to download and play regular files. It's still worth maintaining a subscription, since it funnels some of that money to the studios.
Surprisingly enough, this is something the porn industry gets right. AFAIK, most paid/premium porn websites let you download any movie. No bullshit.
I've stopped pirating music though - Spotify became good enough for me to be worth it.
So no, I bet a majority of your "pirates" will stop pirating if there was a decent legal alternative.