Yawn
The Pacific ring of fire is continuously active, as are Etna and Vesuvio. Still the world has not been shrouded in a unpenetrable volcanic ash clouds and the Pacific and Med seafloor are not littered with jet airliner wrecks. Even if Ejzkzjlzjyzjklz@klzjokul continues to belch, burp and fart for two years like it did last time, airlines and authorities will adapt and plan around it.