You don’t need dilithium silly, that’s just a gimmick they came up with to control a matter antimatter reaction as a power source. You could power the warp field generator any way but of course antimatter gets you the most bang for your buck.
But ... but ... When it comes to power source selection, doesn’t it make sense to use the one with the greatest potential for a universe ending cataclysm?
(Perhaps the current regime is visionary! They are conserving coal use on Earth in order to harness it as a cheap and safe method of field generation in outer space!)