Israel's so-called 'high-tech advantage' is yet to deliver a 'total victory' against the outnumbered, outgunned, imprisoned, and literally starving Gazans. So what
@925boy said was correct: The power the various militias have arrayed against Israel in regions around Israel WILL be enough to cause a strategic defeat of Israel.
Manpower is still VERY important. It is not like the militias would be charging with swords against machine gun fire--something like that might have happened during World War I in a few places. The militias are dug in, deeply sheltered where even bunker busters can't go in and they have lethal-enough weapons. Israeli bunker busters have often been inadequate even on the sandy Gaza and here we are talking about the hilly areas north and northeast of Israel.
Finally, short of threatening a destruction of Teheran, I don't see Iranian would back off from a war. Of all the forces arrayed against Israel, it is the Iranian
govt which is the most powerful and perhaps the only one which can stop a war. An analogy would be the Japan of 1945: Only when the destruction of Tokyo itself was proposed (after Hiroshima/Nagasaki) then the Japanese
govt surrendered, otherwise the Japanese would have fought on even as Guerilla war to the bitter end.