This is quite damaging for Parity[1]. This combined with the Multi-Sig Wallet debacle[2] will require a lot of effort from Parity to rebuild their reputation.

As the valuation of crypto-currencies such as Ethereum increases the ability to target such vulnerabilities goes from simple malicious or destructive hacks to security compromises that have material costs beyond a reputation for both the developers and users of these platforms.

These exploits will also slow the wider adoption of particular platforms, the Blockchain space is right now quite competitive and market value is very closely linked to attention and interest in a platform's blockchain competency.

[1] https://www.parity.io/ [2] https://news.ycombinator.com/item?id=14807779