a) i am unsure what ncwest is doing. they have lost quite a bit of players to core (players who spend) over the last 6 months. The last few events have been a bust as far as big spenders going heavy on them. The prices are insane, la vie is a perfect example.
ultimately, what their revenue is at the end of 2020 will dictate what happens. it seems like they are trying to make all regions similar. we have one of the most expensive p2w regions next to japan.
b) i think players who are invested here typically stay here. there is no other "L2" to replace this with aside from core. for an NA based player, i have issues with core and playing there actively (not a huge population for my play time).
I will say, people who spend are speaking with their wallets. I spend a hefty amount on the game monthly. I have needed la vie for over a year. I didnt spend past my 1 super pack on lvl 1-5 boxes because the prices to make lvl 5+ were just insulting and the lvl 1-5 boxes giving me all lvl 1's was a joke.
i still play actively, but I am considering moving to core or quitting if things dont change in the next few months. When summer comes, without a worldwide lockdown, you will see the player base drop dramatically if things dont change.
edit: we do have the new refreshed L2 coming in 2-3 years. however, i dont think that will exist past korea. there is literally not enough players to support launching that from the ground up anywhere except their largest playerbase, which is korea. sadly, i think they are milking this product until it closes down in 2-3 years. Then, who knows.