Tier 1 regimental NW as we have known it for a while is indeed dead. But like the conversation I had with people on 15th TS yesterday, League 2 will become the new League 1. But thats ONLY if someone takes up the mantle to host things in an effort to keep the community alive.
Don't forget, there are still flourishing communities in NW such as the PL one which has multiple regiments still doing 20+ 1v1's etc.