Solar system is 4.5 billion years old. The sun has been around the galaxy 18 times since forming.
And as you can see from that image the gases that make up star forming regions are literally blown around by the nearby stars.
So combining fragility of a nebula with time plus 18 loops and I think it's totally gone.
Plus I saw a YouTube video a few days ago that theorised that earth sized rocky planets would only form around suns in star forming regions with nearby massive bright stars that would be actively tearing the nebula apart at the same time that the planets were forming.
Likely the stars born from it (including ours) accreted most of the gas & dust and the rest dissipated through stellar radiation pressure. Its been more than 5 billion years.
