I'm not sure why people see this as a bailout, the money is not lost yet if what's being said is true, it hasn't been spent anywhere, it is still inside the DAO essentially. The DAO did a good thing by keeping the problem contained and buying time. Now, if the attacker was able to spend the ether all over the place, then the situation would be dire. But this is not the case.

Yes, it is a blow to decentralization if the Ethereum Foundation intervenes in order to block this attack, but I believe they can do it in a way that benefits everyone in the long run (except the attacker). Markets are not going to be a problem, they are based on speculation already, the risk of volatility is what it is. Centralization has its uses, it acts as a focused weapon. Decentralization and centralization go together. Sure, we should be cautious about who we allow to wield weapons like that when thinking about the future, but someone/entity needs to wield it for certain things to work socially (the power WILL be seized one way or another, and there is plenty of it to grab, and that goes for every cryptocurrency space).

The Ethereum Foundation is fairly powerful, but still limited in the motivations needed to conspire against the community. Just like with Bitcoin core, power hierarchies will not be escaped, but they are something we can live with in times of need, it's a safety mechanism fueled by trust and a common vision. Until that vision truly turns sinister, beyond FUD, the system will be able to correct course and continue to grow, especially as emotions settle down

Keeping these funds safe is a huge opportunity, it would be simply wasteful to allow such a large sum of money meant to fund Ethereum projects to be lost, when it could be recovered in a reasonable way. It would also show resilience.