I mean if you have a casino that reaches 80 million in 10 years that is not that great, which means if you take it all by itself 80 million is not the achievement here since we applaud places that does it in 1 month but find it loser if they do it on 6 years. That is why I think we should focus on how quickly windice became big, they are not even 6 month old yet I think and they already broke the 80 million number, you can calculate how much big places like stake (which had the help of primedice) gets wagered daily and compare it to windice and you will realize that windice is as famous as the biggest ones out there and that worth a ton.
In the first place, do every site should aim for that? I do not think that any site would achieve that actually because there is not a must that on each site they should claim to have some wonderful wagered. This is not a competition for them but it is somehow a milestone that they need to have. So there is no limit time to achieve it, as long as they can keep on growing and make their players satisfied then this should not be a problem. And btw you can't compare on every site because on each of them should have their own ability to survive on gambling industry