Modifiers like that would also punish someone who has 3 squads microed behind cover that just happen to be too close to each other. It also punishes a 3-way flank on one location when the units get close enough as they close in. Modifiers are generally a bad idea.
The problem with blobs are that the counters are not effective enough (MG suppression) and that they are too effective at taking counters out due to lmgs (lmgs might need to be toned down because they decrew MGs before getting suppressed) and (mainly for okw) schrecks.
I would suggest a similar thing to what Cruzz did in his mod: change the effective range of lmgs to not the max distance of the gun but bellow that and make the damage drop after that point (though I'd argue that it should drop more than it doess in Kappatch at the moment). That way a-moving a lmg blob is far less effective.
I don't think you quite understand my suggestion. I stated "Relic should institute a modifier on infantry of 3 squads or more
moving in unison outside of cover."
Moving in unison outside of cover means that the squads are out in the open and moving in the exact same direction (a-moving). In that case it would not effect units who are strategically positioned in cover. I also really don't see how this would effect flanks as the squads are spread out and moving in from different directions.
You are correct, the problem with blobs are that the counters are not effective enough. Institute this modifier and they now become effective without them becoming OP when used against a single squad. You're suggestion seems to revolve around one thing: MG crews being decrewed by LMGs. That is a problem but if you increase suppression alone the blobs will just come back over and over again from different directions until they find a flank. Nerfing LMGs in fine but it doesn't address shrek/bazooka blobs.