Regarding predictions of a crash (as distinct from predicting the time of a crash), a good pair of questions may be:

1. Is there a major housing bubble?
   
2. Have major housing bubbles consistently ended in crashes?

Regarding (1), A friend of mine who experienced the Hong Kong bubble (and crash) says that the bubble pattern in the U.S. is very strong. For example, aside from conventional statistics, one sees many people leaving professional-level jobs to become real estate agents. It is hard to see what new, real factors now justify this reallocation and re-training of skilled labour.

Also regarding (1), a striking graph (thumbnail):

Regarding (2), an example of a crashless end to a comparable situation would be interesting.

Words and ideas I offer here may be used freely and without attribution.