I think it comes down to RMC not really offering a product Six Flags is currently interested in. After the most recent round of sales, only five parks owned by the chain lack an RMC creation...
Canada's Wonderland: Probably the most likely park in the chain to get a new RMC at present, especially as one was pitched in the survey, but I definitely wouldn't bank on that being a near term project given the direction the company is moving.
Carowinds: Next most likely, but given that they're surrounded by RMC attractions in Georgia, South Carolina, Tennessee, and Virginia, it might feel a bit late to the party.
Dorney Park: Don't see them getting anything from the company given their two biggest competitors already have RMC attractions.
Kings Island: Eh, maybe, but I feel like they take so much pride in their collection of wood coasters that a hybrid might be seen as sacrilege there. Plus, with Steel Vengeance just across the state, anything that isn't a top two or three RMC ride would be seen as a disappointment at the property.
Knott's Berry Farm: California already has four RMC coasters at other parks. Knott's is very restricted on what they're able to build. An RMC would not be the best use of their very valuable real estate.
At least domestically, RMC is really running into the issue of a shrinking market for their products, and that is not unique to Six Flags. Most parks that want a large RMC attraction already have one, and the smaller raptors don't perform well enough to be worth the investment in larger, coaster saturated parks, but at the same time the price tag (which I've heard is in the neighborhood of $8 million for the basic Stunt Pilot model) is too much for many smaller parks to afford. I'm sure if RMC comes out with something that Six Flags wants to buy we'll see the two companies working together again, but I don't think they'll be the guinea pig for a novel new design the way they were in the past and will wait until a product is established before spending money on it.
