What might have caused the decline of StarCraft 2 numbers?

How balance patches affect StarCraft -    • What if we stopped patching StarCraft 2…  
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Timecodes:
00:00 intro
00:40 Balance
03:20 Region lock
08:30 Monetization
11:20 RTS Decline
Sources:
Our own various videos from the channel
Best SC2 of 2014 - The Best of Starcraft II 2014
Best of SC2 2016 -    • The Best of StarCraft II 2016  
Best SC2 of 2015 -    • The Best of StarCraft II 2015  
WCS 2012 highlights -    • WCS Europe Finals Highlights  
Arc Warden Dota 2 -    • "Mastering the Arcane Art: Epic Arc W...  
CS GO Revolver OP -    • CS:GO - When the Revolver was OP as F...  
WarChest Video 1 -    • Zerg Cerberus Units Bundle (War Chest 5)  
WarChest VIdeo 2 -    • StarCraft II – War Chest 6  
WarChest Video 3 -    • StarCraft II: War Chest  
Dota 2 join the battle -    • Dota 2 - Join the Battle  
SC2 Hots trailer -    • StarCraft II: Heart of the Swarm Open...  
SC2 Lotv trailer -    • StarCraft II: Legacy of the Void Open...  
Dota 1 gameplay -    • DOTA 1 - SNIPER GODLIKE GAMEPLAY | Wa...  
Artosis Cast BW -    • MASSIVE Attack! | CNSL 7  
CoH 2 gameplay -    • [CoH2][1v1] Propagandacast #1423 [WM]...