hacked right? mt.gox was the only one hacked, we had a lot more exchanges than we have today.
The second part of your sentence couldn't be further from the truth. In 2014 there was only a handful of exchanges. For altcoins, apart from Cryptsy and Poloniex there wasn't very much out there. Now every kid in a basement is running an exchange and I'm not even mentioning the DEX.
Exchange "hacks" might have been a bit of a restrictive statement. I should have added pool hacks (Nicehash?), government clampdowns (China, Korea), online wallet hacks (ledger, MEW), large infrastructure hacks and worms requesting payments in BTC or XMR, repeated regulatory rebuttals of crypto ETFs (Winkelvoss), centralisation of BTC wallets (most BTC are still held in a handful of wallets who are regularly dumping in a neverending stream)... All the above is hitting confidence in Crypto hard. We need a proper stream of good news for the prices to stabilise and start going up again. This hasn't happened yet.