I can't speak for others, but sometimes "real life" gets in the way...
I not only have my 15 year old son, but I have a 2 1/2 year old son and a 4 1/2 month old daughter that take up a LOT of my time... and it wouldn't surprise me if others get caught up with other home issues, or work schedules, etc...
When the month of May rolls around, I will have been on this board for FOURTEEN years...

... and there have been MANY lulls over the years, including the Spider-Man forums... this particular lull is about one or two months long... big whoop... if the history of this site tells me anything, it's gonna get "lively" sooner rather than later.