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Most freemium MMOs and MMOs in general, take months to finish (especially if you raid or want highend items).
What about an MMO that can be completed within a week. The MMO would, instead of relying on release content...come out with DLC every week or multiple times a week (preferably). The DLC could vary in price, depending on how much content it has. Preferably this DLC content could be finished in a day or less.
If they released enough DLC to match a 15-20 dollar subscription, with a bunch of a dollar or whatever DLCs...and the game itself was free (or buy to play)...the company could get new players rather easily, and keep people playing with constant updates.
As it is...it takes months to finish an MMO (way too long)...and you tend to wait 3+ months for a major content update to come out. There are a couple companies that release monthly updates, but they aren't very common. And SOE releases major expansions quite often, but they are on the pricy side. Most are nearly the full price of a game. And again, they take far too long to complete. In this case, there would be a lot of DLC...but quick to finish and cheap to get.