Senoufou. You rightly highlight again the fact that a "one size fits all" approach is doomed to failure. As many have said, people are on the streets for a variety of reasons therefore it follows that only a multiplicity of approaches will help reduce the problem. Dormitories in a modern day workhouse environment are not going to be any part of the solution, other than a temporary expedient providing shelter from harsh weather. 50 in a room against freezing in the street is a no brainer for all but a hardcore. The closure of many large Victorian asylums(Psychiatristsc hospitals) in the 80's left many exposed vulnerable people, as shown below
"Yet in 21st-century Ireland, one of our worst fears for de-institutionalisation has come to pass ? while inpatient beds have fallen, lack of appropriate accommodation alongside shortages in community-based mental health services have left some people with severe mental health difficulties with nowhere to go for a safe home.

https://www.irishtimes.com/opinion/homeless-people-with-mental-health-difficulties-need-more-than-key-in-the-door-1.2062351
https://www.salon.com/2013/09/29/ronald_reagans_shameful_legacy_violence_the_homeless_mental_illness/
http://www.treatmentadvocacycenter.org/storage/documents/backgrounders/smi-and-homelessness.pdf
http://bjp.rcpsych.org/content/179/5/381