~ we risk fiasco of unsuccessful segwit transactions and/or lost coins because of segwit security vulnerabilities. Even Slush pool CEO (inventor of bitcoin mining pools) said that he first needs to see segwit transactions, until then no one knows.
only idiots and FUDsters think like this.
there has been lots of tests on the testnet so far, testing the SegWit transactions.
there has been multiple altcoins similar to bitcoin that have already implemented SegWit and have had it for months now.
one of these altcoins is litecoin and there has been many SegWit transactions on it, and it is worth a lot. if there were any "fiasco" it would have already happened, specially by the enemies of bitcoin.
True, and litecoin is the fastest coin I've ever used.