Looks to me like altcoins decoupling inversely to Bitcoin:
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Yes, indeed. What I think is happening is that, finally, mercifully, the market is understanding that none of the popular alts today offer anything meaningful over bitcoin. So why not just use bitcoin?
A few dynamics are playing out:
1) The litecoin fanboys' idiotic "ASIC-resistant"/scrypt-is-better rationale is finally empirically false (though those of us with just 1/3 of a brain figured that out in 2012). So that entire family tree of coins is now obviously just clones/tweaks.
2) The new crop of anonymity promising coins is getting even the relatively thick-headed to question why these alts that offer nothing over bitcoin command such value. All the discussion of fungibility has raised the anon issue to the surface, and I think many people have realized that it might be the first meaningful "feature" an alt could actually offer. It looked like the test was going to be Zerocoin, but now we're seeing the CryptoNotes supposedly offer this. Whatever the ultimate reality of whether those coins do what they claim, or what may ultimately win that particular use-case battle, the point is that more would-be lite- nxt- dark- feather- junk- coin fanboys are now asking "why?" just a little more deeply. And that's not a good thing for any coin but bitcoin.
You forgot the dynamic where certain Bitcoin only fanboys were saying "Litecoin is doing to die blah blah blah" when Litecoin was $0.005 each in 2012.
Only if those who were saying "Litecoin is doing to die blah blah blah" gave a timeframe AND didn't see the potential for a temporary rise due to the then-current ignorance of the community. Being right on the fundamentals often comes with a high-tolerance for waiting until the market catches up with you.
Of course we are seeing a shift from alts to Bitcoin, but the cycle will continue I believe as long as there is the free-space to have alts.
I actually think there is space to have alts as well. But as with the precious-metals market, I think there will only ever be a few that have lasting value, and one that has orders-of-magnitude dominant value.
Don't be surprised if a coin like Litecoin sticks around much longer than some may anticipate. I'm not bullish on Litecoin now but I do believe you will see it bottom out and rebound as it has so many times before.
Litecoin hasn't been faced with the two things I noted above before:
1) Having some of its core misguided thesis irrefutably disproved.
2) The emergence of coins with actual feature-benefits to the ecosystem, not just more me-too clones.
I agree that litecoin will continue to exist, probably with non-trivial value. But if I had to bet at even-money that LTC would be the #2 crypto in 5yrs?...nope.