I fully agree i also hope maybe they could do a free for all/free roam online with bigger levels and more players maybe even safe zones add uniqe loot and make it full blown Action RPG
I don't think it should be a semi-open world, I think the way it is now is fine.
Too be honest im surprised to see how many people agree with wanting a semi / fully open world. Listen I share the same fears about it sucking as the ones who dont (This was easily my among my top 3 favourite games this gen, EASILY) but I see this franchise as one being Naughty dog could experiment with. Take Uncharted for example now if somebody offered that being open world I would have disagreed because there is no way in hell that could have worked (in my opinion ) however this game could have atleast a big expansion on the levels (due to the ps4's capabilities) making it last longer and ultimately more enjoyable. In my opinion.
EDIT: Remember I still want them to keep the story linear, like I dont want to see a big E on the map leading me to ellie so she could give me a mission, that is not what I mean.