Again...in aggregate. Again, are you contesting that the alt-marketshare as a whole has not been a fairly consistent 5-10% of bitcoin's mcap over the past few years?
Of course not, that is historical fact, although for a short time I think it was somewhat higher. LTC peaked at about
$200m, and BTC at about $12b, so that's around 16%, or perhaps 20% for alts in total] $1b, and BTC at about $12b, so that's around 8%, or perhaps 12-15% for alts in total. (I'm not sure of the exact total during that peak, so this is a guess.)
What I'm saying is that if you look at the value fluctuations within that range, the correlation is not consistent with the theory that growing alts gravely threaten Bitcoin. It is not statistically insignificant either, it is highly significant. But it is
possible, as I mentioned, that this observation only holds within the historical range and would break down at some higher range. I see no evidence for it, but I can't rule it out.
If I had to guess I'd say it is possible the Crypto Apocalypse theory only holds if Bitcoin were itself to reach a much higher valuation first. Given that all crypto is currently embryonic, factors contributing to the overall success dominate, and benefit all viable cryptos (including Bitcoin) as potential participants in that overall success. This includes even direct competing alts showing Bitcoin how to do things better, or pushing it to do so. To tie this into the current conversation, to the extent that side chains are a reaction to alts, and side chains make Bitcoin better, than alts have helped Bitcoin!
But if you're not seeing the theoretical threat to crypto-scarcity (somehow trying to refute the idea of the threat with scant statistically insignificant data?), that's just odd. FWIW, I don't think alts will *actually* dethrone bitcoin and trigger the crypto apocalypse you reference, just that I think it's rational to consider that the scarcity argument for bitcoin/crypto would indeed be threatened if alts gained too much ground (and, no, I don't have a magic threshold number in mind). I really don't see how you can dismiss the theory, unless, again, you're drawing linear conclusions from small amounts of data.
I don't dismiss the theory at all, I merely question it.
I think it is possible for a better crypto to dethrone Bitcoin without invalidating the entire concept, just as Bitcoin dethroned previous failed or aborted attempts at cryptocurrency and far surpassed their success. If something far surpasses Bitcoin's success, then Bitcoin will turn out to be just as irrelevant as those earlier efforts, except that all are relevant as stepping stones that lead to the next. Given that roughly a factor of at least 1000 separates Bitcoin from fiat, there is a lot of room at the top.
Quite possibly none will ever exist, or doesn't exist now, so this is not intended as an endorsement of any current or even foreseen alt. I just acknowledge the possibility and question the theory that anything challenging or surpassing Bitcoin invalidates the entire concept. In fact it could very well take the concept to a far greater level of success, just as Bitcoin did.