While you can pour over tutorials on how to use Emacs; just watching a video of a power user using Emacs gives you a different impression. It is really a completely different experience.
Sometimes it is faster to produce a set of video tutorials than to prepare well-written documentation. Hence they make a call. However, I agree that written documentation is the best medium for long term (i.e. smaller, searchable etc)
So, rather than asking for one medium of instruction to stop, I would rather encourage the plurality. Let the end-user pick and choose whatever he/she likes.
I personally don't like video tutorials. I rarely watch them. We don't have one on our site either. But many of our members have been asking us for one.
Our site also features video tutorials of other websites, and interestingly, I've heard many of our members cite these video tutorials as a major attraction of our site. They like that they can see essentially video demonstrations and tutorials of a website.
To each his own.
Patio11 links a service that crowd-sources the translations, while the cost may be high for a beginning blogger it is peanuts for a startup or a high traffic site.
In one of my better elementary school science projects (not saying much, the rest were awful) I tried to compare auditory and visual learning in memorizing sets of numbers. The only result I remembered was that I learned better from reading the numbers on the page and that my siblings were different.