I had to explain this earlier this morning with someone asking how to fix the Predator franchise. Just make another.
They don't have direct continuity with each other so simply making another is the easiest fix. They might not even have to spend much money on the Predator FX either for a subsequent film seeing as they just have two Predator suits they didn't use in the final product.
You may be right about Predator 2 to The Predator though. Both films ended up getting mauled at release, got accepted over time and occupy a niche space in the franchise. That's very likely to befall The Predator. Ironically they may also have the same issue of overspending though in The Predator that's due to FOX panicking.
Considering Predator 2 led into the AVP franchise I'd find it hilarious if history repeated itself considering there is demand for more crossovers now. I don't know what Predator would crossover with but if Terminator that would be a funny if not bizarre way to get Arnold back.