OPEC's aim isn't to keep prices as high as possible. If they go too high, people will start buying electric cars, investing in renewable energy, etc. Basically they want to make oil as expensive as possible while preventing it from getting so expensive that it's disruptive.
OPEC's goal is as much profit as possible. They're not thinking in the short term but long term. If as much possible means over the span of multiple centuries then that's what they're going for.
I think we're in agreement here. I don't think memory manufacturers are interested in a market disruption even though profits are incredibly high for a few years. Make it too profitable for too long and others will arise but keep the supply at a steady pace with decent margins and they will remain the only ones on the block because of massive upfront cost.
China is, to my knowledge, the only country that has so far had the willingness to seriously invest. Not necessarily for profits but for independence reasons. I don't see many (or any really) other countries following suit.