Okay, so we all know that Ymir Fritz found the source of all organic matter and only lived for 13 years. But what if were able to find the source and save his life and those of the others cursed with Ymir’s fate?
NOw that you mention it, it seems like this would be a logical conclusion to use this part of hte history to continue the overall story. I've been thinking about how would the author continue the series with killing off its major characters every once in a while due to something that the author created. If Eren can find that "source of all organic matter," then hypothetically he could continue living a longer life, maybe even become the second founding titan, or something else, the possibilities are endless. But, at the speed in which this series is progressing, i'll be teaching for a good 10 years before we get to this part lol
At least we can imagine the possibilities of what could happen if Eren did find the source. Or even Armin through the whole divide and conquer concept; Eren being a decoy and Armin looking for the source.