I believe that your question is too broad to be answered succinctly. Over that wide a time span, such terms as 'class' will evolve or disappear. Fifty years may not make that big a change, but 150 will. In the 50 year time frame, I think whatever you can 'afford' you will have. Poverty will mean that you get housing, food, education and health care for free, but it will only be routine and basic. The very rich will not need anything from the government and will only 'mix' with the very rich. The vast majority will be middle class, as now, but will be so stratified, based on background, that they will be hard to classify. In 150 years, there will be no rich on earth, as they will have emigrated to the stars, no poor as they will be eliminated, and middle class will enjoy a spiritual, healthy, aware reality based on kindness and understanding. We won't eat animals, as they will be museum specimens only, but will be growing enough food and manufacturing enough nutrients, we won't need animals. Health care will not be needed, as we will be born healthy and stay that way - the wars and poverty that breed disease will be eliminated - and we will be fairly homogenized. Anyone who feels their life is 'bland' can chose to explore space. See you in 150 years!