No. all lawsuits are about uploading. The nature of BitTorrent is that typically every file you download is also being uploaded at the same time and it's the uploading (the unauthorized distribution of copyrighted works) that gets people in trouble, not the downloading.
As I said, they're very much still suing people for uploading. Public trackers are the low hanging fruit, but when a private tracker gets raided they'll jump at the chance.
> What these law firms definitely don’t care about is going after uploaders, that would obviously ruin their business model.
The RIAA/MPA have zero concerns that they're going to run out of people to sue. It will never happen. Their goal however, believe it or not, really is to try to slow down internet piracy though. Right now, their largest cash cow is at the ISP level, where they intend to force ISPs to permanently disconnect pirates from the internet and never allow them to have another account after nothing more than repeated and unproven claims that an infringement took place. If they wanted pirates to continue so they could drag them into court rooms they wouldn't bother with these "repeat offender" suits which will effectively cut people off from the internet entirely since people have limited options for ISPs.