You will get bored in 2-3 weeks, then you will use the "open only" feature to hunt PowerPlayers... My estimates is PP will die within 6 months if it's made open only.
but that's another discussion.
If you actually played, you'd know that most of the powerplay community members are already flying in open, and have been since the start from what I understand. A majority of the people actually doing the activity want 'open only', a majority of the whiners who don't want any open only features aren't even participating. I'm not sure why FDEV even listens to their bleating sometimes, they certainly aren't in here helping me fort for the Empire.
We already hunt one another, and the fights are fantastic when we can actually instance.
Some solo-only players would quit, but that wouldn't necessarily be a bad thing. Some might come to open and discover that escaping enemy interdiction isn't all that bloody difficult.
Most of all, we would all finally get to see who is doing 350K+ of bad 5C prep hauling for Aisling. Inquiring minds want to know.