I remember reading that AI built their proprietary "KeySlot" rail system to be stronger than the KeyMod system. Just like the new Q Rifles designed a new rail system for their Switch rifle, I don't think AI will make a change any time soon, unless it was for the next gen AX, and it was an improvement in strength/durability.
IMO precision rifles don't have the same market for hanging tactical doodads off of them like the AR market, so there isn't a huge benefit in terms of selling accessories. Plus, out of the box an AX comes with enough rails to satisfy most mounting needs.