How can ”Supernatural” possibly End?

As a fan of ”Supernatural” I am quite happy sticking with the show for as many seasons as it goes , to be honest it's the only show I really watch anymore. This current season we see the Winchester boys losing everything they've come to know and love, cas is dead, Bobby is dead, Bobby house ( which was the only real home Sam and dean ever had) was destroyed, they lost the use of their rock aliases ( due to the LaviaClones) , and most painful of all.......... The Impala is in hiding. Needless to say Sam and dean are dealing with some serious shit this season, but question I ask is how with all the crap the boys are dealing with this season, and all the crap they've dealt with in earlier season, can this show possibly end that would be pleasing to me and all the people who watch and love ”Supernatural” ? During earlier seasons When people would ask Jared how he'd like his character's story to end, he would say ” I'd really think Sam should die”. That would be great way for Sam to go out, if it hadn't happen a dozen times already. The same thing goes for Dean ( infact , thank to the trickster or Gabriel , he's died like 126 times). With a show that has never ending evil trying to destroy the world, and characters that can die and come back to life, can it have a series finale that ties everything up in a nice bow, and not make its diehard viewers feel like they wasted years on a show that went nowhere? Personally, I think the season 5 ender would've been a great finale( just without Sam under the street light), but they decided to continue the show, which I have bittersweet feelings about. So, I ask you, my CMB brothers and sisters, had do think or want ”supernatural” to end? In my head , Dean was killed by the hands of Lucifer in the episode ”swan song” and the past two season was just Dean's slice of heaven . Dean can't live without the job or his brother, so his heaven would be a never ending road trip fighting evil with Sam, but in reality everyone is dead , Sam IS Lucifer and world has burned. But that's just my idea, What's yours?