Funnily enough, the catalyst for something like this to happen would have to be one of the island teams getting the automatic World Cup spot instead of us, and put up a historically bad World Cup (double digits bad) to get FIFA to either disband OFC or make it 0.5 as is now.
2026 WC is planned for 48 teams and OFC with 1.5 spots. So a WC playoff route will stay alive, just not likely to involve the AWs (probable OFC winners). Actually planned to be a 6 team tourney with a team from every confederation bar UEFA, and 2 teams from WC host confederation, ie 2 teams from CONCACAF WC 2026.
So yes is possible one of the Island teams could get past the likes of Oman and El Salvador, and make it to North America 2026.