I've worked with about every major consulting firm in the last 5 years (I work for a large publicly traded company that has gone through mergers, re-organizations, etc.)

Interesting concept - like fivver on an upscale market? In my experience CEOs don't typically browse the internet to hire high quality consultants. They read an article or see a speaker that speaks to an issue their business has and then starts a relationship with that person that will then lead to a possible consulting engagement. When companies hire consultants they are seeking a solution that is tailored to their situation or company. I don't know if they will start buying in a more on-line less interactive mode or not moving forward; but I would spend some time on how companies buy what you are trying to sell.

As far as getting top consultants - many are paid 25% of an engagement they sell and another 25% of the engagement they deliver (workshop, speech, assessment, etc.). That is what you are competing against + their company provides research, copy, content, editors, etc. So they would lose that too since they could hardly go on their own while also working for a Bain or McKinsey.