Inevitable, sadly (in my opinion). Some effective treatments are being discovered, but they remain costly. I'm in SW Ohio, and you would not believe the devastation it has caused. I could count on one hand the number of ash trees that have survived down here, out of thousands, if not more. Several courses here have prospectively removed all ash, simply because the dead trees look terrible, are a safety hazard, and you can't stop it.
And despite bans on moving firewood between counties to prevent its mobility, it still moves right along, county to county.