I think that problems posted here tend to be cyclical in nature. There are times when I answer the same questions regarding the same problems several times in one week, and then don't see that problem again for months on end.
Yes, there have been a lot of Marek's-indicative problems recently, but I think that they tend to crop up in clusters. Marek's is pretty common. A little side story- Recently, someone posted on here (in exasperation) "Why does everyone always assume that every problem is Marek's?" I think I responded at the time "Because the signs are indicating that the problems may indeed be Marek's." The poster never commented further, but it does show that at that point in time there were several posts on this forum that related to Marek's or Marek's-like illnesses.
I think a way to improve this section of the forum would be to start tracking incidence of diseases. We, as the grassroots of the larger trend of backyard poultry keeping, should start taking note of disease trends. It can only be, yet another, valuable tool in our arsenal.
Thanks for bringing this subject up. I think it merits discussion. I hope others will chime in with their opinions on the matter.