There will be a lot of face saving aspects to this incident and we will probably get a skewed version of events putting 100% blame on the aircraft manufacturer.
Regardless of face saving, it's very likely that passengers' lawyers will try to blame the aircraft manufacturer, simply because there's more money to be had from suing a US company (Boeing) in a US court than from suing a Singapore company in Singapore. No doubt SIA's insurers will try it too, to avoid having to pay up.