There's too much wrong with the basic gameplay that causes this game to be frustrating and uninviting for new &/or solo players.
The experience you have when you are alone or new does not scale well into late game, the experiences are so drastically different and the entry level gameplay is not adequate enough for longevity of the game. Hire a new gameplay designer, hell I'll do it myself if you want, I've entertained over 10,000 unique players in a game mod i've created which is nothing in scale of what you guys do but it's something.