First thing, Pantsir isn't a vehicle for ground forces. Ground forces near equivalent is Tunguska.
Pantsir is based on Tunguska and was intended to be a cheap simple containerised version for the air force to defend fixed locations like air fields were the expensive and heavy 34 ton tracked chassis of the tunguska was not needed.
With UAE money however the Pantsir-S1 was developed... why look a gift horse in the mouth. The Tunguska replacement will be Pantsir-S1 based though for mobility it will need a tracked chassis through there will likely be wheeled versions.
Second thing, ground forces AA troops use both tunguskas and strela-10M in mixed battaries.
Yup... I know... Tunguskas for mixed gun/missile air defence batteries replacing Shilka and SA-9, with SA-13 also replacing SA-9. And also missile batteries replacing SA-8 with TOR. Lots of Strela-10M in service because they are relatively cheap... lots of OSA still in service because they are cheap and TOR is expensive but also very capable.
Sosna's missiles were initially designed for new version for Tunguska, as I know, so there the vehicle on MT-LB chassic can be an export only vehicle and russian ground forces will recieve new tunguska-like vehicle with sosna missiles and strela-10M will be replaced with another type of vehicle with IR misslies. Or may be the armed forces will change the concept of close-range AA battalions, switching from Tunguska/Strela-10 mix to Sosna-only battaries, but as I said IR guidance do have it's advantages (if a missle is locked on target, there is no need of LoS to it). Or the ground forces may switch from SPAAG-missile systems like Tunguska to missile-only system like this MT-LB Sosna, but I don't think so because autocannons are useful things.
Personally I think the main problem with Tunguska is weight and the upgrade with Pantsir-S1 missiles and sensors makes this worse not better.
Personally I think the typhoon and possibly Boomerang units as well as VDV units will get SOSNA replacing Tunguska because it is lighter and cheaper... I think the ultimate replacement for Strela-10M will be Morfei. In heavier units the Tunguska will be replaced with a Pantsir-S1 based missile and gun vehicle, but to save weight the SOSNA-R might only have one gun or no gun at all.
I think TOR will continue to be used in newer models too.
The problem for the VDV is that no model of Tunguska or Pantsir-S1 would ever be light enough to be air mobile, so SOSNA-R will likely be used to replace Strela-10M with Morfei also possibly being used too in a light vehicle.
It's not a rule, as Kornet and Sosna uses sophisticated multi-spectral lasers which is bery difficult to disrupt even by countermeasures, not a mere smoke
...no, I meant that quite literally... from launch to about 2 seconds after launch the missile will have a large booster strapped to its rear so the laser sensor in the rear of the missile will not be able to see the launcher till after the booster is jettisonned. Smoke can be an issue to when it is a column 2km long, but the old Tunguska used to aim slightly to one side before launching its missile so the smoke plume didn't hide the target and the missile from the guidance system and SOSNA could easily do that too.
The exportable missiles, like 9M340Eh, don't have the very fast-burning, high-impulse motors; so not only they are not of as high a performance level but they also "need" terminal guidance during their first stage burn, hence the use of radio command for that.
Interesting idea and I will not disagree, but terminal guidance is guidance during the last phase of flight, which means terminal guidance during the first stage is a contradiction.
I am not understanding this interstage you are referring to...
I would suggest that all these missiles... SA-19, SA-22, Palash, SOSNA etc... which are all clearly related to Hermes... all use initial guidance in the form of command guidance... it is cheap and simple and means to can direct the missile to a useful direction during the first phase of the engagement... even if it is to prevent the missile hitting obstructions on the ground when engaging close targets.
the burnout range of most of these boosters is 1.5-2km so a target that is within 3kms needs to be aimed at fairly early on... a missile just launched in the general direction with no guidance till the booster falls clear might only have half a second to manouver if the target is flying very low 3km away... guiding the missile out of the tube means less manouvering when it changes guidance to its primary terminal guidance.