There is conflicting info about life expectancy.
Cleveland Clinic says:” With proper treatment, most people with bronchiectasis can expect to live as long as someone without it.”
NIH says this: “If properly treated and monitored, most people with bronchiectasis have a normal life expectancy. People with bronchiectasis are more likely to die because of other medical conditions that affect all people (like heart disease or cancer) than to die directly from bronchiectasis.”

People with severe lung disease and smokers are more likely to have a reduced life expectancy.

I also want to add that more attention is being paid to bronchiectasis now with the specialized clinics that help us manage the disease and with the patients forums that help spread helpful information. There’s even a new drug for bronchiectasis itself coming out this summer.
I find many reasons for hope. My PFT had even improved at my last visit.