There is only capital ship upgrade material available in arena store so not really helpful if you have all your capital ships maxed with the current lineup.
For a better solution why don’t we put new ships in the fleet arena store. That would make way too much sense though. Why don’t you put anything new in any of the stores, Galactic War, Cantina, Fleet or Arena it’s been over a year and the same stagnant inventory.
No one who is serious about this game is going to quit playing fleet anyway because you need it for Zeta mats