Oh, <yawn>, why do we need to talk about this?

Tedious thread!
In answer to your question OP, Doctor Who won't be finishing for good, any time soon because the show keeps getting high ratings and the stories are good. Also, the current production team know how important the show is to fans.
It would be such a travesty, if the show was suddenly pulled off the TV again. Fans would be in uproar about it. There would be a lot, and a stress, a LOT of people taking to Twitter, Facebook, AND Digital Spy to express their views.
The fans would be angry, plus very upset. I would be quite upset, and angry too. I'm such a huge fan of the show, and have been for nearly 9 years, since Russell T. Davies brought it back.
As for Michael Grade who put the show on hold for 18 months in 1985/86? I do not like him at all. He's disliked by me, and he always will be. He was responsible for starting the ball rolling for DW's demise.
The production team between 1986 and 1989, didn't feel as though they could write good stories and try to make DW look good after what MG did, because they felt as though they would spark rather a 'bad' debate with Michael. They wanted to try and stay on his good side.
Yes, I think DW should have a year's break every few years, just to give the cast and crew a rest, but NOT cancel it. A show like DW needs to have that break, once every few years.