Well, I don't think you can take Håkan as proof that Oskar would manage. Oskar and Eli would live under quite different conditions than Håkan and Eli did. Just consider shelter. While Håkan as an adult was able to rent decent apartments for them (three times), Oskar would hardly be. And neither would Eli. Not realistically, notwithstanding how easy it is for them do do this in some of the fan fiction here. Think about it: what landlord would even take a twelve year old caller on an apartment ad seriously? Besides, a child cannot make a legal agreement, which the very majority of landlords would require.OskarTheArsonist wrote: ↑Sat Jan 20, 2018 4:20 pmif Eli and Oskar did in fact not plan to meet each other again I don't think its because the only way to live with Eli is to be a vampire. we have proof of this because Hakan lived with Eli and while he did die it was because he was trying to feed her, and Eli would not make Oskar do something like that since he actually cares for him. the lifestyle Oskar would have to chose (and did chose) would be a life on the run but I also don't think this would be the reason they went there separate ways. what I think is the most likely reason is that Eli knows all to well what immortality really means and he did not want to live with Oskar watching him grow old while he would forever be stuck at age 12.
Eli's need for help after his long rest periods would also create a great obstacle. An unturned Oskar would be of little use in this respect for several years, so Eli would have to enlist an adult helper in the meanwhile. And he would have to expose Oskar to that person. I don't think he would want to. Therefore, also for this reason Oskar would have to be a vampire.
But all this said, I think you offered the decisive reason why Oskar would need to be turned if he was to live with Eli. He wouldn't remain the same person for long otherwise, they would grow apart. Eli would know as much, perhaps from personal experience, and Oskar would understand it too, at least conceptually.