Life Expectancy with MAC, Nodular Bronchiectasis

Hello,
My name is Mark. 73 year old male, active, never smoked, who completed prostate cancer radiation 6 months ago. Recently had a CT scan of chest that shows many enlarged nodules. Will have a bronchoscopy to biopsy a nearly 1 inch nodule. The radiologist diagnoses bronchiectasis. Pulmonologist suspects I have MAC disease of some sort. My only symptom is daily, intermittent, chest heaviness/tightness. I already have IBS-C so can't imagine being able to tolerate the antibiotic cocktail treatment. Assuming I can't do the antibiotics, does anyone have an idea of life expectancy? I know that is a difficult topic to discuss. Thanks for any thoughts you might have to share.