LiG counters any infantry movement, Pack Howie is crap and the Katyusha is weak+too expensive. Also, as of now infantry can just run straight at allied HMGs and throw their nades.
The Crocodile is a good counter though. Such a terrifying thing.
If your opponent is truly schreck blobbing there shouldn't be enough le.IGs to stop your infantry from advancing to close range (assuming you yourself are not blobbing). Pack Howie is not crap, it actually performs better than the le.IG with vet. Katyusha is a weaker and more expensive counter, but if you are able to cover it with shot blockers and get a close range barrage off on a blob with it you will likely wipe a few squads. As others suggested you can either layer suppression or simply move the team weapon back (it shouldn't be hard to tell why he's charging his volks/grens into your machine gun, just dodge the obvious nade).