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In all honesty, the Exoskeleton that Whiteshirt bonded himself to likely won't be seen as most effective in the recovery of Spartans, but rather the effective upgrading of normal human military personnel into combatants able to fight on the frontline against the Covenant. (In the sense of what it will be remembered for the most)
Ackerson is a very cost-oriented man, and as the war goes on, efficiency becomes a stronger incentive. I imagine from the purely efficiency-oriented perspective, a suit that can make a normal military combatant, which costs pennies compared to Spartans, able to stand up to, and even injure Spartan personnel, even if the suits cost nearly or equal to Mjolnir, would be able to even out the playing field on many frontlines.
Of course, it does come down to the price, if the body truly is needed to be sacrificed to use the suit, and if the blood heavy metal poisoning problem is fixed or not. Buuuuut i could easily see R&D within Mjolnir being shifted away to focus on Exo reconfiguration and development.
Not to say that there won't be another generation of Spartans, or that Mjolnir would die out. More so that Mjolnir might become a branch/fork of the larger Exosuit development, specialised in making suits that use existing Mjolnir tech planted into this new "baseline" exosuit design(depending on the level of bodily mutilation required for operating the exosuit) or try to meld the suit together with the exosuit design for less intrusive (aka bodily sacrifice) use. Meanwhile, standardised models for use by regular military personnel (again, with the level of regular usage being dependent on the level of bodily mutilation required to use the suits, since "Suicide super suits" would still be useful in last stand fights)
