They will lose lots of customers this way. Don't know what's more profitable for them, rebuild the netcode or losing people.
I am part of a big italian gaming community, and they are all pissed. No one of them is subbing until they fix it. And this discourages other players that were thinking to try it.
And I think that not many will be back anyway, after a fix... they're playing and want to enjoy the game they payed *now*, not in a few months, also in the meantime they'll move to another MMO (ESO is coming, and it's not the only one), and I don't think you want to move back when you moved to another shiny new toy.
