Mendicants in the 21st century Is a life of begging and poverty well suited to the modern world (21st century capitalism)? Not just the will to give it up, but to not suffer for it.

Aren't Buddhist monks traditionally mendicants?
A bhikkhu is literally 'one who lives by alms'. However, it is not the same as a beggar because the laity that provide the alms get something in return - access to the wisdom and insight of the bhikkhu. Kasi Bharadvaja Sutta gives the Buddha's words to a confrontational Brahmin who refuses to give alms to the Buddha because he does not believe the Buddha 'works for it'.

The conditions for surviving on such alms depends on a laity that is interested in learning about the Dhamma (and hence supporting those that strive to gain direct knowledge of it). Really, the world is much more interconnected, there are far more people, and finding some who would be interested in your message would not be that tough imo! Finding a quiet and secluded spot would be more difficult imo! Here's a story I found: https://bhikkhucintita.wordpress.com/2014/01/28/alms-round-in-america/ I guess if the cultural knowledge is not there, it is a matter of educating your laity and getting them into the practice!