It would have been a completely new design... at a time when four new vehicle families were being introduced. It would just make more sense to incorporate its ideas in some of the new vehicles.
the whole idea of the new vehicles is to reduce logistics so for this vehicle to do better you would need a unit consisting entirely of this vehicle type... it was not a jack of all trades vehicle which means you would need to develop a whole family based on that chassis... and I think from what I have seen so far the Kurganets already looks better... the Stalker had no Shtora, nor APS and from memory looked like some sort of foam plastic hull material instead of NERA or ERA.