Re: Ea Agent - Battlefield Hardline Cross-play Option
Yeah, EA wouldn't do such a thing because that'd be too much of a hassle since they're older games and Hardline is considered a black sheep in the Battlefield franchise. And really EA doesn't want to give more reasons for players going to past games instead of their current games which in their eyes give more monetary value (despite them keeping "Surprise Mechanics" into their old games)
However, with Portal and while I doubt this would happen but maybe they could add some sort of Hardline into the game be it a special event mode, maps, weapons, gadgets etc. I have no doubts that elements of BF4 will find their way into Portal.
Who knows? Hardline could make a Portal appearance if enough voices are raised in the future?