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I think it will be Gene hunt`s dream and everyone else part of his dream.
decent on instead like Blankety Blank.
Much like every other TV show ever has done that builds up to a big finalé and twist.
See also: BSG, probably Lost & 24, most season ends of Dr Who etc.
a) It's left for you to read what you want into it as the writers couldn't work a decent ending out themselves
b) It was all a dream / a black hole resets everything / etc as the writers couldn't work a decent ending out themselves
c) Someone who you thought was dead BUT ISN'T REALLY did it all along, a device employed as the writers couldn't work a decent ending out themselves and had run out of all other options