Series three finished with a cliffhanger and no ending. Why the heck can't these production houses plan things better. I get it, ratings go down a bit, ditch the show.
Well in that case, plan and write the series so that the actual ending is at the end of series three without the need for a fourth series. Bloody dishonourable morons. Art and business don't mix so well. I want to know what happened !
They could give the go-ahead like what happened with sense-8. Fund a final chapter. The final act could be compressed into a single movie length episode.
So they save money, and appease us fans.