If they can use Iron Dome to intercept missiles in flight, the should be able to target the launch sites quickly. My concern is about the number of coincident launches. I suspect there is a swarm strategy out there which may appear shortly.
The old MLRS system we had 20 years ago had amazing counterbattery rosponse capability. In addition to Iron Dome, there needs to be immediate and overwhelming counterbattery fire, within a minute or two of every launch.
My biggest problem with Iron Dome is that the Palis will be able to bankrupt Israel by shooting $1000 rockets to be intercepted by $500,000 missiles.