There's a ton of BR games in development. Most will fail.
It's already a stale genre. Just cause Fortnite is successful means nothing. People mostly ignore the fact that FortNite is popular because of it's core mechanics (building), and the BR mode just makes it competitive / a fun arena to play in.
Just another BR shooter is tried & done already, H1Z1 first, now PUBG. New games won't compete with PUBG without some heavy investment.
Realm Royale might make it, but again, it's somewhat popular because it's a BR game that is entirely different than the FPS style.
If you're looking for an FPS BR game exactly like PUBG, but with better developers... good luck with that, don't think it'll ever happen. The ship has sailed.
But you might see a ton of variations on the BR style... we have the Minecraft version with Fortnite, and a MMO version with Realm Royale... just need a MOBA / Overwatch version next.