If those corpcoins were truly decentralized, distributed and peer-to-peer, they would convey no advantage.
They would
not be decentralized and disitributed.
The corporations would provide the blockchain processing and hold large stocks (maybe even infinite) of coins, using them to maintain price stability etc., and will collect fees from their use. Those corpcoins will look superficially like bitcoin in the way people will use them, but of course will not be anything like the libertarian dream. For 99.9% of the population, that will not matter.
Or they could be issued by governments instead of corporations.
Or they could be something else entirely, who knows what governments, banks and stores may invent.
As for present alt-coins, why do they make you doubt Bitcoin? Success always has imitators.
Because they void the argument "one bitcoin will be worth a small fortune one day since there are only 21 million of them and umpteen trillion dollars of e-commerce per day".
There are many things wrong with that argument, but one of them is that there is an
infinite number of
cryptocoins, and they all are in principle as good as bitcoin for the purpose of low-fee payments via internet.
Umpteen trillion dollars divided by infinity is equal to zero...
So I would have to wait an infinite amount of time for you to admit you were wrong?
I will admit that I am wrong (about bitcoin being a terrible investment) when lots of people really start using bitcoins for payments, not because they want to support the cause but because they are more convenient and cheap than other methods;
and demand for that usage becomes large enough to justify the current BTC price,
and the yearly growth of that price is greater than that of the ROI of other investments.
And I would be very happy if only the first of these three condition becomes true (although I am pessimistic even about that).
As I see it, right now the bitcoin price is sustained mainly by speculation: by "hodlers" who will buy at even higher price if they had the money, by day traders who do not look beyond the next month or two, and by people who see it as a form of gambling.