It's almost confirmed that NA is only gonna get 5 spots and I'm seeing some people complain about it, but the truth is NA is starting with a big advantage anyway, and here is why
Americas league will be placed in LA and I don't think anyone is gonna doubt it's the most stacked one (compared to EU and Pacifics) with Optic, Loud, Xset, Lev and some other great teams. If you think about it, due to geography, the teams from NA that don't make it into the franchise will have a massive advantage just because they can scrim with the franchise teams, while on the other side Latam and Br will only have each other to practice with (not to mention that they're gonna lose their 5 best teams), what are the odds for a Br/Latam team win ascension? It's most likely we're gonna see a new NA team making it into franchise every year, so the minimum Riot could do is give Br and Latam 5 spots from start.
And also, NA has a strong top 4/5, but their teams from the bottom would easily be smashed by a lot of BR teams such as Furia, Nip, TBK and VK, why would it be fair to a blended Americas league to give to a region way more slots than the others two, if they are not as competitive as some may think it's?
5 slots to NA is a lot already, if the teams are so good then they only have to win Ascencion, people want a stacked Americas league, not a league with a strong top 5 and a bad 6-10.