I'm not misunderstanding you though and I get what you're saying, but it only makes sense if they want to trade something with. A few popular IPs aren't going to cut it. Companies like to buy the entire things that add something value for. Disney is getting Fox because they want to add content to its streaming service and Comcast bought DreamWorks Animation in order to launch its Universal Kids Television to compete with CN, Nickelodeon, and Disney Channel. What kind of values does a Weinstein Company offer regarding its assets? As you said, it's a waste of money and Weinstein Company is looking for a new buyer and to tell u the truth, it's not gonna be Comcast. It would be nice, but I don't see it worth offering unless there's something valuable about it.
As for the horror movies, I'm not saying Universal is leading, but they've been producing far more horror movies recently in general than Lionsgate and WB, thanks to BlumHouse, many of them are pretty decent or good. Lionsgate's Saw franchise is pretty much taking a dive at the moment and its last film didn't go do well with the critics. Honestly, Universal really needs to use its IPs for HHN mazes and less too much reliance on 3rd party companies with certain exceptions, especially American Horror Story is in danger of being phased out by the Disney/Fox deal.
You have a very good point regarding IP transfers: companies don't usually buy IPs outright, instead focusing on buying subsidiaries or studios. With regards to that, I feel that if a film company wants to buy TWC's horror IPs, they could go the alternate route of buying Dimension Films, which is the subsidiary of TWC that makes Scream and Hellraiser movies, as well as a bunch of other genre films. It could be sold for cheap, as again, TWC is desperate for buyers, and Uni is probably in the best position to buy it, given that the other film studios are probably too distracted at the moment. To wit: WB is dealing with the antitrust suit and JL bombing, Disney-Fox is trying to get the deal through the DoJ and probably doesn't care about small fry like TWC, and Sony and Paramount are broke. Lionsgate could potentially bid up the price, but I believe at the moment they're gearing up to enter the superhero fray with Hellboy and wouldn't want a pricey bidding war with Uni. That doesn't mean Lionsgate can't try to bid for Dimensions, but it's unlikely they'll be able to get it.
I disagree that buying TWC, or at least Dimension Films, doesn't add value to Universals. While it's true that Blumhouse has a good working relationship with Universals (and has made them a pretty penny in the horror market), it doesn't change the fact that Blumhouse is a third-party company that can, at any moment, break off its relationship and get a distribution deal with another company. After all, Blumhouse did start out working with Paramount. While I don't think that's going to happen anytime soon, any company as big as Universals is going to have that in the back of their head, that's just the nature of the business. Purchasing Dimension Films will help give Uni a stable of established IPs that they can reliably fall back on just in case they can't do
Insidious or
The Purge anymore. Put another way, Universals isn't really a name in horror.
Blumhouse is. Dimension Films could, potentially,
make them a name in horror.
I also don't agree that
Saw is in a dive at the moment. While it's true that its opening weekend was somewhat poor, it's grossed an insane amount over time, getting one of the best multipliers in Saw history and making a killing at the international box office. For reference,
Scream 4, whose predecessors reliably made $200 million + at the worldwide box office, opened $2 million higher than
Jigsaw, but ended up grossing $4 million less. That kind of multiple is unheard of for a Saw film in particular, so they're almost definitely going to up the ante with the next film.
(Side note: I know this might not be the forum to discuss it, but has anyone considered the possibility of Uni possibly
buying Blumhouse? I'm not sure if it'd be an attractive investment for a large corporation like Comcast - Blumhouse's model relies on a large number of flops per year - but given their current relationship, I don't think it should be ruled out. It's happened before with Dreamworks, first to Viacom then eventually to Universals. I think Blumhouse is in a good enough place that they don't have to consider selling, however.)