I am not the smartest, but....
I think
anonymous coins are a fad
fads only last a while, and then they go away
A reason why this fad may fade, is because the real world financial sector
may begin to embrace non-anonymous coins, while rejecting anonymous coins,
and comes along with large amounts of investment dollars,
that anonymous coins miss out on,
and investors in anonymous coins then sell, and go looking to invest into coins that
are being invested into by the real world financial persons.
Anonymous coins would then be a smaller niche, than the larger categories that
the real world financial sector might invest into.
( they won't likely want to be associated in any way at all with criminal or black market )
Multi-national corporations are among the very first in line to adopt a technology that prevents their competitors, the government, and external auditors from observing their accounts on the blockchain. The criminal or black market is a drop in the ocean compared to MNCs. They are craving a way to surreptitiously move funds between continents to tax havens in a way that does not require huge forex hedges.
That having been said, I can fully agree with your last point about association - MNCs will want to use something that does not sound like they're inherently doing something illegal. They're unlikely to have line items in their quarterly income statement that contain the words "dark", "teleport", "stealth", or "cloak" unless the corporation in question is DARPA:-P