Never say never. These things will be mounted on ships right? Ships sit on top of a pretty big heat sink if I’m not mistaken.
Well it’s a trade-off; if the rounds are much smaller and your dumpinng in less power, you can get a higher rate of fire.
But themal management is a huge problem; you won’t be pumping out 32MJ shots to 100 nm at hundreds of rounds a minute, even on a ship.
Key thing is the barrel erosion problems preventing any refiring at all seem to have largely been solved.
We also have the slight problem that we really don’t have a ship to put it on; the DDG 51 Flt III design is horribly cramped and basically filled just by putting the new AMDR radar on; you can get a small railgun on if you delete the 5” and lose a bunch of VLS cells.