For basic consumer level: yes (for most people)
For pros and such: yes, but not for all. Especially those people who say LP records sound better than CDs, they will keep telling optical viewfinder is the best invention since pre-sliced bread.
However, at some point, there will be LCD screen at the viewfinder, so you don't see the actual image through prism/mirror, but the image captured by the sensor and then displayed at the viewfinder LCD screen.
With current technology, it's not good enough that most people would use it. But give 5-10 years, for sure you can't tell it from the real live view.
There's also one big benefit, as Mathias mentioned, live view drains your battery. That's because the 3"+ LCD draws plenty of power. Using smalled LCD at the viewfinder will draw much less, so it doesn't have such impact on the battery life.
So mirrorless will come eventually, and the transition starts from the consumer level and slowly transforms up to pro level. Most likely there'll be model or two for those who insist mirror, but at that point there's really no benefit for that.