Fleet carriers are pretty cool, there's no argument about it. And they're extremely useful, as they basically serve as a mobile base.
But there is a big downside: fleet carriers are very expensive to maintain, let alone buy one, and I think this really discourages a lot of people from buying a carrier.
So, I have an idea for an alternate option for getting a fleet carrier: frigates!
Frigates can be similar to fleet carriers, but are much smaller, thus, being much cheaper to buy and maintain. They can serve as a mobile base of sorts, and be a place to repair and restock weapons and all that, and can also be part of a fleet if you also happen to have a fleet carrier already.
But because of its smaller size, frigates wouldn't be able to offer certain services, such as the shipyard option, and would only have small and medium landing pads, because of size.
I don't really know if this would be a good idea to add into Elite Dangerous, but I think it would be cool to have those in the game, to add more kinds of ships and things to buy.