Gintama's 아니메 is waaaay to 인기 in 일본 to just end.. The 망가 itself is in the 6th ranks and the 아니메 is even 더 많이 인기 than that and the DVDs sell really fast. In fact the 은혼 franchise is the one that makes sunrise the most money. Also the seiyuu and several of the staff have said that even they aren't sure if the show is really ending 또는 if its just an end trope to make 더 많이 money for the movie. Plus its been states recently that since the movie is selling really well and has already reached a (I think it was) billion yen.. That it may come back based on that.
My opinion is that the company just got tired of catching up to the 망가 and having to stop every half year/year... So this time they decided to wait it out.. Maybe even pull a 이누야사 final act and just when the 망가 ends come back and animate it all.. Since they ended the show with an actual chapter from the 망가 as and ep instead of making up and ending like most shows its highly likely they will come back.
In 은혼 and Gintama', they ended because it got to periolously close to the anime. Gintama' Enchousen also caught up close to the latest 망가 chapters, so that's probably the reason it stopped. But that doesn't guarantee there will definitely be 더 많이 episodes, though. There are chances that this may depend on how well the movie sales goes 또는 something, but anyhow, I wouldn't take the ending seriously considering this is 은혼 we're talking about.
If 당신 see the last episode farewell shiginami...it says that the shiginami will return...also a new enemy shoyo "gintoki's master" has shown up...so maybe they will do an arch on him...so i would say they will make 1 또는 2 더 많이 archs to 덮개, 랩 it up in 2017 또는 smthn
