Why not both? Hire forrestv full-time to work on P2Pool and spin up another group (maybe headed by Luke-jr?) to improve GBT. Bitcointalk is making about $5k in profits per week (based on some back-of-my-hand estimates on undisclosed expenses such as the sysadmin that was hired along with the known expenses such as mods), which gives plenty of room to work with without even touching what has been stored up. Bitcointalk could currently sustain two full-time devs at $120k/year.