... I think they will be doing both. They currently have ~2500 sats in the ~53° constellation. The V2 system that has been approved and is targeting similar latitudes has 3 times the sats, and each sat is claimed to support 9 times the bandwidth of the current ones. So if they need to triple bandwidth per user, they can still increase subscriber count 9-fold and meet it.
... I think they will be doing both. They currently have ~2500 sats in the ~53° constellation. The V2 system that has been approved and is targeting similar latitudes has 3 times the sats, and each sat is claimed to support 9 times the bandwidth of the current ones. So if they need to triple bandwidth per user, they can still increase subscriber count 9-fold and meet it.