I am (was) a jumper at Snohomish who sat through the new four-hour WS procedure briefing a day before it was canned. From what I understand, there were no WS incidents at Snohomish other than the occasional off-landing (which all disciplines have had). Someone from Snohomish, please correct me if I'm wrong.
For what it's worth, below is the bulk of the email from the DZO:
"Following months of research, review and collaboration with many members of the greater skydiving community, this decision has been made in the interest of maintaining high safety standards at Skydive Snohomish. Much progress was made in coming up with an acceptable procedure to accommodate existing operations and DZ specific variables. Some of the major issues that Snohomish faces which can't be easily changed right now are the two LZ set-up, up to 3 planes routinely operating at the same time, wingsuit flight paths over densely populated areas, the lack of comprehensive training and qualification, and the increased logistical workload it would take for DZ staff and the wingsuiting community to manage qualification, in-air separation and communication. I spend a great deal of time considering the skydivers and their ambitions, and the last thing I want to do is unnecessarily bridle anyone's passion for the sport or the discipline they choose to pursue. Individually, the above issues could probably be addressed, but as a whole they represent a safety risk that in good conscience, I can not support."