While there is tons of "Free MMO's" out there, non of them are cyberpunk. This game may never appeal to more than a few thousand (more for than enough to keep the game feeling populated) it all comes down to how big money they want to make. I feel a niche crowd would happily pay a subscription to play an updated Neocron. So if they charged £8.99 for say 5000 people then your pulling in around 500k a year.

The main issue seems the initial investment to get the game up to scratch and advertisement. Hard to estimate that though.