@jepoy The Quiapo area can be reached from Central Station. Or, Doroteo Jose if they prefer Avenida. It's easy to get to UN Avenue from Pedro Gil. Sure, it won't be convenient without Carriedo and UN stations.
Bambang… it can stay but one other station still has to go. Tayuman? The stations along that part are too close, the train engineers don't even have to bother increasing their speed beyond the minimum required to get the wheels rolling.
Quirino Station. If parks are the only reason, there are jeepney routes plying nearer to the parks than the station can provide. And people who haven't been in the area before don't know those parks exist. I think "parks" fits the UN Station more: the vast land of Rizal Park, and the adjacent Intramuros historical site. It's a plus for the UN Station than to Quirino Station.
Either way, these are only what I think based on my own experience using the original stations. The LRTA holds the data for each station so of course they know better which stations are in the Top 5 for potential closure.
Or, maybe, partial operations. Say, whichever Top 5 stations those are, at certain times they're skipped. Say, Quirino Station. Non-peak hours, the station is skipped. During peak hours when the Station receives the highest count of passengers, the trains stop there.
Hmm… now that I think about it, if IIRC, they did something similar to that back in the 90s. I recall hearing "this train will skip the next station". Once when I was in Monumento, they skipped 5th Ave. and another when I was in Baclaran Station, I had to wait because the current train was going to skip Libertad Station.M
Maybe they can review that and see if they can implement it again.
Anyway, the original stations of Green Line is not like the Yellow Line (MRT-3) where there are no other choices than to use trains, like from Mantrade Station to Ayala Station. Public transportation along EDSA is the worst. But along Taft and Avenida, there are plenty of options.