First off, some people are acting like the OP is pushing for FORCED solo instances, they are not... if you want to grind around others, then don't utilize the instanced solo option.
If they make 5 dungeons with an update and 2 of them are solo. That means 2 are not for groups.
So in a way, yes they are being forced since we're getting less content as a result. There is literally a hundred solo instanced dungeons in Skyrim (the game). We don't have that many group instanced dungeons in ESO.
Already for the retail box of the game you get ALOT of solo content. The group game is rather weak and needs addressing, badly.
Apparently you didn't read the article I posted? Clearly ESO is designed to be a pretty much solo game with 'play with others' tacked on. They have already removed the concept of 'group only' zones. They know who their majority of players are and will focus on that, but will add some group content here and there.
World bosses, dungeons, cyrodil pvp , trials are the only multiplayer aspect of the game, everything else is even too easy for a solo player. I would like to have every kind of enemy is dangerous instead of leather scraps.