I recently submitted a paper to a conference and was just blown away by the quality of the reviews (double-blind). Not only were they very detailed, but they were also very informative and insightful. They really helped me move the work forward. I wanted to thank the reviewers (which I got a chance to do in the rebuttal stage) but also to perhaps even contact them for a follow up on their comments. I thought that I could perhaps add them as co-authors or even offer collaborations.

I was wondering if people thought whether or not it would be appropriate for journal editors or program committees to allow reviewers to connect with the author following the end of the review cycle should it be requested by either side. What would the down-side of such a follow-up system be?