First of all, welcome back to GW2! There have been a significant amount of changes to the game, not only WvW, but SoR herself.
Yes, we have moved down in ranks over the last 2 years. There have been several situations where tensions between individuals and guilds caused there to be a few upheavals, resulting in a change of the player dynamic in WvW. This resulted in our slide down in ranks.
As of today, there are several guilds in SoR dedicated to rebuilding our WvW presence. It is a slow process because everyone wants to be sure that we do not have to face another exodus like we have before. There are plenty of people to kill, roamers and zergs alike. Many people prefer to roam in order to flip things quickly, or find fights with others to test their skill. There will always be zergs, people not used to roaming, or likes the atmosphere of being with a larger group.
There will always be something fun to do in WvW for any play style you have!
Good luck, and happy hunting!