To the OP, you have clearly misunderstood what Sony is doing. They have affirmed over and over again that they will continue the A-mount and they put their money where their mouth is by continuing to develop and release fabulous A-mount lenses. Most recently they have released new versions of two of their top tier professional grade zoom lenses.

The SLT was intended to be a transitional technology from the beginning and this was clearly stated by Sony in a number of venues. All along their goal was to get rid of the mirror but AF technology, especially on sensor PDAF just wasn't there yet so they had to go with the SLT for a short while.

At the same time they developed the E-mount NEX line and it has done very well too, but it was never intended to replace the a-mount. There certainly is cross-over between the two as evidenced by the up-coming full frame NEX and the multiple entry level a-mount cameras. Also the LA-EA2 adapter really makes it interesting, allowing NEX cameras to enjoy not only A-mount lenses but PDAF as well.

No one knows exactly where they are going but it would appear that the e-mount may end up with a larger share of the entry level products and the A-mount may focus more on the higher end. Either way, these are distinctly exciting times for the A-mount and Sony in general. In just a few months we'll have the first ever mirrorless, native a-mount camera. Of course the million dollar question will be whether the AF is really up to snuff... I guess we'll just have to wait and see.