Photorumors reported that Sigma and Tamron might be discontinuing their A-mount lenses a few months ago. B&H Photo currently has 20 Sigma lenses for Sony A-mount. Similarly, B&H Photo currently has 28 Tamron lenses for Sony A-mount.There hasn’t really been any development of A-mount beyond the a99II for a while now so maybe A-mount will continue to limp along if 2nd hand sales remain strong. It’s still widely believed that Sony A-mount will be discontinued in the near future, but there will be a large legacy lens lineup available for years to come.