Sure there is, and there still is a market for it, though it is much smaller, Or perhaps the same size as it was shortly after these games first started arriving. However, I don't know of any that truly make money. I can't recall the names of some of the games, but I have a friend who plays one regularly that involves all sorts of battles, city building etc, and its almost all text on a web browser.
I think your key trouble is getting people to try it in the first place. Ads with images that reflect the game (or in Evony's case, reflect half naked women) tend to attract more people.
However, this seems like a great idea for people to play while working, but since its text, it won't stand out as a game to passers-by.
The key thing is going to be coming up with a concept that you can show in 30 seconds or less that will really pull players in. I think that a text game is great. Movies didn't stop the production of books. Videos didn't kill the radio stars. The technology can work, but players are technology spoiled, and need a good reason to go try something 'inferior'. Word of mouth works, if it really is good, but even the players will need a good way to express the core concept of the fun in the game easily.
The game that my friend plays has a concept that he brings up a lot, and that is that you can join alliances, but the alliances can use each other's resources when others are logged out. I.e. After a certain point of not being online, your production stops (resources being full) and other players in the alliance can then call on your soldiers, stone, wood and food into use for them selves.
So what will your concept be? something that can catch people quickly and simultaneously express it self well with just text?