Um.... going to have to differ with you.
See the thread Xix posted (I just added three more videos of additional content soloed)
If you look at that thread, you will see that people have been soling current raid content for every expansion since Wrath. I've been doing a couple of bosses on Normal each week and have gotten down every boss on Flex that I've attempted. I should have enough gear to down at least Protectors and Norushen in SoO Normal on two different ten man teams this week. It will be fun to see if I can do more in the coming weeks.
It isn't easy and takes some time to get your teams ready, but I only upgraded my accounts to MoP about six months ago. I started with some level 85s then and I'm soloing raids now so the time commitment isn't insurmountable.
So it can certainly be done, not easy and takes time, but I have found it incredibly fun and rewarding.
Some additional things to chew on can be found in the following blog post by Lux: http://www.dual-boxing.com/entries/9...-you-have-them
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