How long does unopened, room temperature pop last?
It lasts indefinitely. The date you are seeing should be viewed as a "best before" date. Over time the soda can become flat and the flavor will degrade, but it will still be drinkable as long as the can was not compromised. 

Based on looking at some Coke I recently purchased, it appears that the date is likely 1 year in the future from when it was canned. The cans in my fridge have a date of JUN1711; I bought these in late July.

Plastic bottles. on the other hand, have a much shorter "best before" window. This is because the plastic bottle leaks the carbonation much quicker than an aluminum can does. I don't have any bottles on hand, but if I recall correctly they typically have a date only 3 months out.