However, just because theyve thought about it doesnt mean they have an exact answer.

If youd asked me season 1, I wouldve thought that it wouldve been the apocalypse.

But then again, you cant end the TV show with the worst thing happening, Ackles says.

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Credit: Liane Hentscher/The CW

I think weve taken some really good turns.

Padalecki adds, Its changed a lot over time.

But Padalecki realizes thats not the only viable option.

All of those kind of leave room for opinion and room for interpretation.

I dont think we should see the boys die or live, we should wonder.

Regardless of the exact circumstances, Padalecki says theres one very important rule: The boys cant stop fighting.

As long as theyre alive, theyre not going to stop fighting.

Were going to have to see them continue to do good together.

I think thats whats the most important part.

The key words there?

As long as theyre alive.

I dont really know where its going to go.

I always thought Dean would make the ultimate sacrifice for his brother.

I guess if I had to choose something, thats probably what I would choose.

Supernaturalairs Wednesdays at 9 p.m.

ET on The CW.