There were a number of factors causing TV manufacturers problems in the late 50's early 60's.
Uncertainty in new tv standards.
Uncertainty about colour TV.
High sales tax on electrical goods.
Possibly too much manufacturing capacity and market saturation in those areas with transmitter coverage.
Probably other causes, everyone may not agree with my thoughts, it will be interesting to see what others think.
Edit, well you have a good range of reasons in three minutes
