Well there has to be a market for a cheaper thermobaric Javelin round. The current round is optimized for top-attack against armour or direct attack against bunkers/soft-skinned vehicles. A single mode thermobaric guided round must offer a cheaper alternative. The launcher firing post is invaluable (round or no round) because the thermal provides v-useful all-weather, day/night surveillance in support of a myriad of assets (sniper pairs for example).
A better choice for a Javelin replacement in Afghanistan would be the
Spike missile (USMC, not Israeli). Smaller warhead for reduced collateral, longer range, 1/5th the weight, and designed to be cheap. It cannot take out a tank, but it would be perfect the antipersonnel role.
Mount an 84 or 120mm recoilless rifle on the back of Jackal or future Ocelot and you have a very cheap line-of site weapon able to provide direct fire support, which is capable of being lifted by a Chinook. Low tech enemy, low tech solution. A far cheaper alternative than having a fleet of leopard II's in support of the battle group. The old Wombat had a mean canister round, turned it in to a giant shotgun. Nice way to clear the green zone in summer, come under fire from the corn fields and bang - problem solved
Stick with the 84mm Carl Gustav, the fact that it can easily be used by dismounts adds tactical flexibility. And you can buy new launchers and the desired munitions on the open market, instead of recreating the production lines for the Wombat.
As for canister rounds, if you are close enough to use them you definitely are within range of small arms and RPGs. Not a good idea with a large, lightly armored, vehicle. You need something that can deploy farther down range.