Pretty close? You've gone from 10,7k to 3,8k.
But sure, let's talk numbers, BWL came out last thursday 5 days, roughly 120 hours of raid uptime, has 3,4k logged and thats 28 fresh guilds clearing every hour. While Nyalotha came out 28 days ago, roughly 672 hours of raid uptime with 3,8k clears, while nyalotha has 5,6 fresh clears every hour.
Also add in that no BWL raid is under 30 people (most are 40 man), while normal & hc are 10+ people, you have a VERY clear NUMERICAL conclusion that more people are raiding classic than retail.