I don't think RC is tied to the value of hive in any way, I believe it can be easily adjusted by witnesses.
So if I happen to be correct, a higher Hive price should actually result to a lower RC required to transact because the incentives witnesses are getting could be a bank maker that simply enables them handle whatever volumes and keep the cost low.
I'm just making guesses anyways.
hmm, not sure. Most systems when they get flooded by transactions means that those who can afford win and those who can't lose out.
You have to stake Hive to be able to transact. To transact more you need to stake more to get more RC (or have it delegated to you). In the short term, witnesses get more money from, can buy bigger kit and systems to support the increase in transactions but eventually that has diminishing returns.
In my view, it is unproven but just my (guess) opinion. Hopefully things scale well.
I already understand this, what I meant was that let's say Hive goes to $100 a coin, witness making like 16 Hive a day from producing blocks are effectively making $1,600 a day, this huge profit from producing blocks may lead to a concensus to reduce the RC required to transact given that Hive is very expensive and they earn quite enough to handle the cost of increased volume.