I wasnt even a Eren Historia shipper but many clues seems to have pointed at something like this, the mystery behind Historia pregnancy and the farmer being a litteral npc or the explanation being given by someone utterly oblivious to the machinations that is going on around him or about how Historia is the only person Eren revealed his goal (theres floch but he needed his help)

And then theres that fucking page that makes no sense on its own, clearly there was something further from here and the reason wasnt to continue to make founding family because Eren obviously refused that option?

At least, him being the father of the child would give a more pertinent motivation for his genocide goal, he's not only thinking about his friends but also about his soon to be born child and by extention his future and Paradis'