Ultimately, even with today's EVF tech, there are positives to both EVFs an OVFs, and I'd call it a wash. As an owner of the A900, NEX-7, and Fuji X100, I'd say I'm pretty familiar with all of the current viewfinder styles. While an OVF may be more enjoyable to look through, do a better job in high DR scenes, and is better for fast motion in daylight, EVFs give a more accurate portrayal of what you'll see on your computer screen (WYSIWYG,) are better in very low light, and are better at manual focusing.
I find the OVF in my A900 and the EVF in my NEX-7 equally useful, but in different ways. I'd have a hard time picking one over the other. All of that being said, the hybrid viewfinder in my X100 is probably my favorite to use, and I can't say enough about having the option of both in one camera (although the current EVF in the hybrid implementation is lower quality than I'd like.)