So, is Solomon Lane done or is he coming back for 7 or 8? Considering he's the only MI villain to survive no only one but two movies so far, why do I get the sneaking feeling he's gonna have one more appearance before McQuarrie and the team on the current movies finally kill him off? Unless the ending of Fallout is meant to imply MI6 is going to put a bullet in his head off-screen, I can't rule him out.
Bear in mind, this guy's dangerous. He's got moles practically everywhere, and he nearly caused a nuclear disaster that he tried to preemptively frame Ethan for. Granted his framing attempt was rather sloppy and the fake "evidence" was so unconvincing that I'm shocked anyone could fall for it, but still. Lane's a menace and I'm shocked he didn't get killed in Fallout. Unless they say in the next movie that he's dead or so tightly locked up that he's never coming back, we haven't seen the last of him IMO.