I'll be playing on PS4, and as far as I can tell, the more the merrier. However, the opt-in concept might actually limit the number of servers I can join, since everyone in there would have to have opted in, and let's face it, if it's not the default setting there aren't a lot of people who are going to take the time to change it.
If it was a one-sided opt-in, though, where PS3 users could join PS4 lobbies, I'd be fine with that. PS3 users would get the short end of the deal, but us next-gen gamers blame them for everything left out of Destiny, so they can suck it up.
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[quote]If it was a one-sided opt-in, though, where PS3 users could join PS4 lobbies, I'd be fine with that.[/quote] That was what I had in mind, yes. Set the opt-in flag and you'd be able to team up with next gen clients for pvp or pve.