Void Crystals are easier to get than LPS'es as of now (All L70 epics drop them 1-2x) and therefor they are cheaper (You don't need them a lot either, while you do need LPS'es a lot).
While Void Crystals will still be in a huge supply the demand might go up a tiny bit, but there's still a 24hr cooldown on the transmute/split w/e so I wouldn't be surprised if the LPS price dropped and the Void Crystal stayed the same or goes up a few gold.
Just my speculation.. People expected talasites to rise in price as well while on some servers they stayed really check after the resilience recipe came around the corner
Just be careful spending all your gold on Void Crystals..