Your required ratio has dropped a little(if you seed everything forever). That's all that has changed. The site, I'm sure, will still be a notoriously hard to seed site. So people will still not be able to download all that they want without having to fear their ratio.
I really don't see the big deal.
It seems they have decided not to apply the simple
(1-(seeding/snatched)) algorithm to all ratio "classes" - they've put it on a scale whereby the more you download, the less you get rewarded for seeding, until you don't get rewarded at all when you're into the 100GB+ downloaded range.
I think this is their way of dealing with the seeding at 1kb/s abuse "loophole" - so that someone doesn't go off and download 200GB of stuff and then just seed it all at 1KB/s and give nothing back.
IMO, it does not need to be dealt in this way. I would do it all differently - I would have a higher raw requirement than 0.60 anyway, I would have the algorithm apply to all ratio "classes" and just monitor cheating activity - which I've outlined in detail in another forum you're at and can't be bothered to repeat

.
I also would use a better algorithm as well:
(1-total seedhours/total possible seedhours), where "total seedhours" is the number of collective hours seeded by X number of torrents in the past week and "total possible seedhours" is 24 x 7 x Y number of snatched torrents - the most you could possibly contribute seeding-wise.
I've said this on other forums already, but I think this particular element of the system (how much the final ratio requirement for the user will be) is where adjustments can be made, for you to see what works - what matters is how fair the system is to freedom with downloading - yes, much depends on the (downloading) culture of the tracker in question, but that's exactly what what.cd's gotta fix.
This is a practical matter and I think with what.cd we will see how it plays out. If more people are downloading, you'll start to get a better ratio anyway. What it DOES very much benefit, is all those users who haven't dared to download much "yet" - they have a big incentive to download more now, and simply seed it. Those users will likely in turn give older users with 100+GB download some ratio pie.
We need to see what happens...even if this change is simply an "improvement" to the normal ratio system by giving a bit of extra seeding bonus for many of the trackers' users and making more ratio pie be offered up, that's a good thing and that's all I'd want. It will just take a bit of time for the improvements to manifest themselves.