Bitcoin is broken, don't know why people still use it when there is a plenty of better alternative 
Name the coin of your choice, then imagine that this coin has bitcoin's user base and number of transaction per day, add unsolicited use of blockchain and aggressive spamming and I am sure that your coin will crumble very fast.
Bitcoin is growing fast, but we have still use the same initial parameters. We need SegWit + off-chain scaling.
Dash, gets hit by DDOS attacks, survives and can scale unlimited amounts. Has a superior algorithm and has masternodes to back it up. Bitcoin isn't being attacked by micro-transactions. It hasn't been attacked since the minimum transaction limit was put in place. The only way to attack would be to spam large fee transactions. That would cost a huge amount, even a no fee ddos costs a fortune.