I can relate with your story, I lost my first PS3 too because of the Yellow Light of Death, but I didn't lost my interest in games because I bought a 360 in that time, and a new PS3 later on. I'm from Brazil too by the way, so I know how expensive a PS4 can be here.
Now, about your question, I think some people will be getting the game for the last gen, here in Brazil you can be sure a lot of people will be playing on PS3 on the beginning, but I think they will go to PS4 later like you're planning to do, in my case I'll be getting the game on the PS4, my best friend is getting the game for PS4 too, so I'm not worried about it, if you want you can play online with us anytime, just hit me on PSN, my PSN ID is "proibido". Since we are from the same country the online connection will be good