What happens though with the new players who are just starting out and can't set up multiple bases? As of right now, that initial HB is the biggest advantage a new player has, and to take that away would really unbalance things.
What about having the standard invulnerable HB, but the ability to make others invulnerable with faction points? That way a sufficiently large faction could setup relays for warp gates and have them remain protected. The drain on FP would be significant, but could be reduced by claiming the system. However, an invulnerable base, with the exception of the HB, would not be able to claim a sector, to prevent potentially infinite unstoppable expansion.
What about having the standard invulnerable HB, but the ability to make others invulnerable with faction points? That way a sufficiently large faction could setup relays for warp gates and have them remain protected. The drain on FP would be significant, but could be reduced by claiming the system. However, an invulnerable base, with the exception of the HB, would not be able to claim a sector, to prevent potentially infinite unstoppable expansion.