Here is a post from Roy's blog.
http://www.roydeanacademy.com/blog
Note where he says that Aikido could benefit from more resitance training. I agree for the most part.
I think AIKIDOKA could benefit, but not at the expense of the methodology.
I want to be clear that I think there are some ways that aikido could be trained better, but not to the point that we evolve it around a model that is based on "effectiveness".