IMO the top blogs are in no way endangered or even affected by a second popularity poll being introduced or by randomization. That's not the point and never has been. The "most viewed" blogs are the most viewed by the blogosphere and public at large. The "most popular blogs/posts as determined by wordpress bloggers" would be just that - so, where's the rub?
I place absolutely no faith in popularity polls. If I did I would have to believe:
(1) the habitual purchasers of the National Enquirer are really only buying it for the excellent photography;
(2) the habitual purchasers of porno magazines are really only buying them to read the articles.
Sensationalism, sex, bathroom humour, and gutter language are all things that speak to the "lower man". I have witnessed all of these in wordpress.com blogs that racked up high enough statistics to put them into the most popular or top blogs but that doesn't make them "quality" publications in my eyes. The most outstanding example I can think of is the two line post with the link to porno tube that racked up stats for weeks on end. More recent examples I've witnessed are a top blog that consists entirely of mediocre photographs of big breasted women, another that consists primarily of youtube embeds, and a third written by a person who used the *f* word in so many different ways in the titles in his listed most recent and top posts that I didn't bother to read any of his blog posts.
That's why I don't support a second wordpress popularity poll any more than I support the one that already exists.
Frankly my dear bloggers [she said with a mischieveous grin] "I don't give a damn what you may say, I'm gonna keep blogging any old way."