The Netflix folks are just doing their job, and they have to. The problem is, people used VPNs and DNS unblockers as they were simple and flexible. There are other solutions that will get around this, and there is nothing Netflix can do about it. It is very hard to protect digital content these days as there are a lot of smart people on both sides of the fence.
It really depends on what they want to do. Netflix isn't going to be interested in adopting policies so draconian that they create hostility towards the company. They want customers to like them.
On the flip side they want to license good content for those customers to make Netflix valuable to people. That is harder for them to do if they can't prevent piracy, the rights holders who own the shows won't sell the rights to Netflix if Netflix can't limit the viewers to just the regions Netflix actually paid for.
It USED to be that Netflix just ignored the VPN users who were a few rogues jumping through hoops to get the content illegally while overwhelmingly Netflix subscribers obeyed the law. They could plausibly tell rights holders that very few people circumvented their system, and nobody cared about a handful of geeks getting a few extra shows.
The trouble is these VPN companies made it so easy for even non technical people to region hop and now it isn't just a few rogue geeks but in fact a very significant share of non US subscribers who are region hopping. Your mom and dad can do it for a few bucks a month.
So now Netflix needs to do something about that, put in some better restrictions that eliminate more of the region hoppers. If a handful of rogues are super savvy and still find a way round it, that's OK, so long as most subscribers follow the rules.
My guess is Netflix will start small with silently blocking the most popular VPNs and only move up to threatening users with account cancellation if that doesn't hammer down the abuse to an acceptable level.
Ironically the fact that people are willing to pay extra for US content by posting a monthly fee to a VPN indicates that a possible solution is a two tier pricing model, where you pay extra to get all the content. Maybe Netflix can negotiate that but it's dangerous, since ALL rights holders would expect to get the higher premium rate for their content and the basic level would become a wasteland.
