I agree with Milkfloat, we're not going to see prices go back to what they were. Reduce slightly, perhaps, but not recede back to some historic figure.
Think of it from the manufacturer and retailer's point of view, they really, really like money. (And why wouldn't they, it's the key reason why they're in business). They've put prices up when they've had to, understandably, to pass on their extra costs to the consumer because to do otherwise is business suicide. But when their costs go down, the nice byproduct is that their profits have now increased without them even raising prices. Why would they then want to reduce their suddenly healthier profit margins?
Look at petrol retailers, they've been doing this for decades; Oil price goes up 20%, they put their petrol prices up by at least enough to cover that. Oil price then comes down, but they keep petrol at the same price for a while, and then only reduce it by a few percent eventually to stay under the radar and perhaps not be the target for riotous mobs. Petrol never goes back to "what it was" even when the oil price goes below "what it was".
Bike parts manufacturers and retailers will very much like the current prices and demand, and they won't need any real encouragement to now see those prices as anything but the norm.
Oh and yes, Brexit has played a big part, ushering in a new era of Norway prices on UK wages.
