WoW - Blizzard will decrease the number of servers

Blizzard Entertainment announced that it will shut down certain World of Warcraft servers. The Shadowlands expansion pack will release sufficient levels of population to allow for the fusion of populations from sparsely populated planets.

Although WoW player numbers are declining, it's still one the most loved games of its kind.
IN SHORT

Blizzard plans on combining World of Warcraft's less-populated servers;
This change is to ensure adequate population before the next expansion pack releases - so players can continue enjoying team-based content.
During weekly maintenance breaks, the servers will remain connected.
Blizzard Entertainment announced that it will shut down some of the World of Warcraft's less populous servers. They will be combined to ensure that there is enough players before Shadowlands, the next add-on. This will make it easy for users to find a group of players for group activities.

World of Warcraft works best when there is a community of players around you. While many new ways to play cross-realm games have been added over the years, many aspects of the game still revolve around a particular realm. It explains that you have more options when you have a server with a healthy population. This includes your guild's history and how you interact with the economy.

Normal technical breaks will allow for changes to be made. Players should not lose access Azeroth for an extended time. After a thorough analysis of the population, decisions about which servers will be closed will be made. The official forums for each Realm will also be closed.

As the project progresses, we will announce the shutdowns in each region and language every week. The affected servers will be merged during each maintenance period. After the break, players from these realms will log in to Battle for Azeroth to see that they are now part a larger community connected servers. It also states that we will merge the respective discussion forums."

It is worth noting that World of Warcraft's eighth expansion, Shadowlands, should be released during the holiday season. The exact release date is unknown.