Ideas, usually have a strong correlation with failure. Irrespective of the execution. Ideas are the base theory within which the execution revolves around. If the premise itself is wrong then no amount of execution would solve it. Think windows Phone OS, Google+ etc. They were pretty incredibly executed products. But never took off because the base premise that another new OS with new APIs and new everything would get developer attention, killed WPos. There was no space for a facebook clone, irrespective of the integration capabilities and good image quality and that killed G+.

Crazy ideas are crazy because even great execution wouldn't be able to save it. ideas and execution need to be complimentary. Saying ideas don't matter is just as wrong as saying executions don't matter.