It seems to me that now is not the right time for an absolute assessment of many projects.The thing is that many projects are developing and are not yet fully operational.In my opinion, the figure of 35-40% of dead projects is quite adequate.
One of the major problems we are having is that, so many of them are just too slow on the development of their products. Imagine spending almost two years developing the first phase of product development and yet not arriving at something meaningful. A lot need to be done.