But I concur they can cause a (major) distraction. But in this day and age, I don't think Iran can freely have large amounts of soldiers walk around or group up freely. They can be easy targets, especially in the Western parts of the country. So this would (I hope if they are prepared) an FPV type of ground war, where Iranian government forces (lets call them that, including police etc. probably) that will handle any incursion.
But I still think a ground incursion by any forces, whether puppets or the US itself, would only happen after the Iranian central government is sufficiently weakened in that it can't respond in a large manner anymore.