Looking around as I play, I see a lot of two-player groups. My wife and I often play ESO together, so we end up chatting with some these people and find out that they are like us - couples or RL friends who play together. Similarly, I have two friends at work that often align their play times to group together. It seems to me that two-player groups might be very common and it may be worthwhile developing more content at a two-player difficulty.
I'd love to see two-player instances, two-player daily quests and even two-player zones.
Moreover, this content could provide challenges for solo players who want something a bit harder than content created for single players.
I'm a middle-aged gamer from Brisbane, Australia, who has enjoyed ESO since PC beta and now into the Xbox One version.