Germanwings crash: Evidence points to mechanical failure, say experts | News | Travel Trade Gazette
I fail to see any "evidence" here. Another BS article.
The aircraft flew in a straight line surely any pilot faced with such a situation would try everything to gain control which would make it extremely unlikely that the aircraft would fly a straight line.
Either they were incapacitated or unable to stop the decent due to mechanics. Both options point to a mechanical failure. As soon as the FDR is found and read we may know more.