I personally disagree. Nexon is doing a great deal of trying for a game that is barely worth running.
I've even heard claims that they operate at a loss. If Nexon didn't care they'd just pull the plug instead of bleeding more money.
The players have a lot more power to change things than they give credit to. Even a dying game can have a friendly and welcoming community.
This is an issue that not only Nexon, but also players have the power to adapt to and fight back against.
When was the last time you actually invited that guy who popped into your channel to your party?
How about party requests? They usually do get declined, but I've had the chance to grind with a few people and it's always fun.
Even if you don't party, just yesterday I had someone enter my map and take the other half while we had a silent agreement going on.
Party play being slower or faster is a non-issue. If you're actually concerned about party play, the speed at which you progress should be second to that.
Given how many people are vocal about party play being dead though, I don't think this is the majority of players.