My question, who will replace the AT-14 Spriggan aka Kornet ?
The AT-15 Springer -aka Khrizantema-?
Neither will need replacement for a while yet.
They are both different strands of ATGM, the Kornet and Metis are infantry systems like Milan and HOT.
the western codenames would be AT-1, AT-3 as first generation ATGMs, with the replacements being AT-5 and AT-4 respectively, though the launcher for both the latter was unified so both missiles could be launched from the same launcher.
the next step was the Metis to replace the AT-4 as the light short range ATGM and the Kornet to replace the AT-5 as longer range ATGM.
Krisantema is a much bigger heavier weapon and evolved from the AT-2 command guided missile, then Shturm and then ATAKA, with the Krisantema evolving from the latter two.
The Metis is man portable and three men can carry a launcher and five missiles, where one man carries the launcher and a ready to fire missile and the other two men have two missiles each.
Light, cheap, portable, and effective to 2km
Kornet has missiles in the 30kg range, so is generally vehicle based, though it can be a light vehicle.
Krisantema on the other hand is more than 10kgs heavier in the 45kg range and like the kornet is not a wire dragger so is rather faster... over 400m/s.
The AT-14 is nearly 25 years old. Isn't time for this wonderfull hardware to find a successor ?
the Kornet-EM is brand new and increases effective range to 8.5km against armour and 10km against point target. Aiming and guidance has been greatly improved too... it is unlikely they will replace it any time soon.
I won't be surprised if Russia unveilles us a new anti-tank missile soon.
there is reportedly an ATGM version of Armata that has an open rear bay with packs of vertically launched missiles. The Russians have been working on fire and forget missiles with lock on after launch capabilities for stealth aircraft, certainly an ATGM with a MMW radar sensor and an IIR seeker chip in the nose could offer a low cost Brimstone like capability with inertial navigation getting the missile up into the air and flying a short distance and then diving on the area the target should be located... a MMW radar and IIR sensor should be able to detect a tank, work out where its engine is and therefore also its turret and hit it with a diving top attack warhead...
A tank should have the communications and battle management resources to engage such targets from reasonable distances.
remember a vehicle launched system wont have the limitations the javelin has, like weight restrictions that limit range and warhead size.
If they can reduce the costs of the seeker to make it cheap enough to use in large numbers it would be a very useful addition to the inventory.
It would also be a useful helicopter launched weapon.
Of course the ultimate heavy ATGM for helicopters will be HERMES.