By way of providing feedback from someone who recently posted for the very first time: while I don't think the new rules would have prevented me from submitting my three extant posts, I do expect that I will be more cautious in the future than I otherwise would have been. (I'm well known to suffer from karma-loss-aversion.)

I'm not opposed to the change, however -- votes on posts should be worth more than votes on comments. (Also, my karma more than doubled when the change was made.)