Randy Pitchford has said that there are NOT plans to convert Battleborn to F2P.
However, it looks like there ARE plans for a "trial" version coming where you can start off playing for free, and then upgrade to a "full" version.
In case anyone was wondering how BB is doing in terms of player numbers, I can't speak for Consoles but for PC it has an average of less than 350 players. That's bad in general, but for a game that's less than 6 months old that was hyped up as much as it was, it's nothing short of embarrassing. It did see a noticeable bump when it went to $15 on Humble Bundle to where the player base was quadrupled, but the fact that it didn't stay shows that price isn't the barrier to people playing; it's the game itself. There's fundamental issues with it if people aren't playing it when it's available for so cheap (It regularly goes for $20-$40 new.) But really it's clear that they need to do more than just make the game F2P. And even though I think Randy Pitchford is a complete douchebag (seriously, look it up, he's a dick and has even argued with me personally on Twitter) I don't wish for this game to do bad.
As some people have pointed out though, with Paladins now making waves as a colorful F2P FPS MOBA style game, Battleborn may have yet another uphill battle if it decides to go F2P.
I don't think that even going free to play would save Battleborn at this point. I think it's probably too late for that. There wasn't much buzz about the game at launch but there is zero now. It should have been free to play from the start. Every single MOBA that has had any success has been free to play while Gearbox thought they could charge $60 for theirs in a market that is already pretty saturated for some reason.
Going free to play now would increase the numbers several times higher than they are now but it wouldn't put them anywhere close to other MOBAs that have been around for years and continue to grow. I think they might just be better off letting that game die than investing the time and money to convert it to a free to play model at this point. Instead of doing that they should just focus on getting us a great Borderlands 3 game.