"if this stays at the missile level of conflict, Israel has the upper hand with a constant supply of missiles from US."
IMO that's where it will stay. Hamas & Hezbollah can't even get involved due to much reduced capabilities.
"if it moves to a land/human soldiery conflict, there might be a different level..... if Iran can gain access to Israeli borders with its army."
IMO very little chance of this happening in any great numbers. They'd have to travel too far, through countries (including it's own) that have no air defenses against Israeli & US war planes.
The US will have 130+ F18's - F35's in the region shortly sitting on their aircraft carriers. They probably have another 100+ on the ground at various bases in the region.
