You can't beat a mirror, it's just not possible especially in low light situations. Discplay screen based digital cameras will always be worse for many users. It's fine as an option but it's not killing the shutter just yet.
I can definitely argue that mirrorless is always better for most users! Thinner bodies, modern lens selection (so faster autofocus and wider aperture, etc), real-time image previews, better low-light preview (in both rear and viewfinder screens), video recording capabilities better match professional video cameras (by removing mirror complexity) which better matches the hybrid needs of the modern camera buyer.