Even in cold tactical terms, the assassination of Ghasem Soleimani achieved nothing. He was immediately replaced and the Iranian footprint in syria and yemen only expanded rather than contracted.More importantly, suppressing token individuals, including of the caliber of shahid Soleimani, will never defeat a system.
What happens is that the system reorganizes in such an event. If the official had extraordinary skills, clout, charisma etc, then the multiple functions he used to fulfill will then possibly be carried out by several individuals. And that's pretty much it.
The enemy might try to score some points on the ground during this interval where the system adapts to the new setting. However, in the case of shahid Soleimani's martyrdom, no such thing was achieved by the zio-American enemy.
Let's take a look at the overall geostrategic picture, read solidity of Iran's network of alliances across the region. Did it suffer any perceptible blow as a result of shahid Soleimani's martyrdom? Not in the least. For Iran, this cowardly act of terrorism did not translate into any kind of a concrete setback on the ground for Iran.
And let's hear it from the horse's mouth: US think tank scholars like Barbara Slavin, senior fellow at the Atlantic Council and director of the so-called "Future of Iran Initiative", also believes that the assassination of shahid Soleimani did nothing to advance US goals towards Iran and if anything, actually backfired on Washington:
Some claim that although the enemy gained nothing in concrete terms, Iran was impacted on the psy-ops level. However, if you pay close attention you'll notice that the very few who evoke a lasting feeling of depression tend to be from amongst those segments of the public which support the Islamic Republic by default, i.e. those not ideologically aligned on the Islamic Revolution but who understand that the alternative to the IR is the destruction of Iran given the existential nature of the enemy's hostility.
Actual revolutionary-minded Iranians - and non-Iranians - however, including tens of millions of grassroots supporters of the Islamic Republic not only haven't been demoralized at all but on the contrary, have seen their impetus for mobilization, struggle, martyrdom increase significantly.
Some commenters have been somewhat quick to lose sight of the religious convictions guiding these Muslim Iranians and their brothers of the Resistance Axis, not to mention the political implications thereof. Lest they forget, this is how we react to the martyrdom of dear ones:
The blood of martyrs is the harbinger of the most fruitful of harvests.
And I'm not even mentioning the long range anti-ship missiles and advanced UAVs Iran continues to proliferate to Hezbollah and Ansarallah.
Even CIA analysts are totally pessimistic about this being stopped. It will continue to happen and by the end of this decade, either group will be armed better than some nation's militaries to conduct a multi-front war.