**Except even then, if they go through all that time, effort, and computing power, *if you take 5 seconds change your password now*, the result they end up with (at whatever point in the future weeks, months or even years from now) will be absolutely freakin' useless, because they'll excitedly run over to lastpass.com, enter in this cracked password, and find it to be invalid, all because you were smart, calm, level-headed, and you changed your password a long, long time before they got to this point.**
You are here. You've been made aware of it. Knowing about it is the strongest and most effective weapon you have against this, because every single bit of concern there might be in losing any of your data is dealt with by the five seconds it will take you to change this password. You don't even *need* to enable 2 Factor Authentication, but if you have some time to understand it (it's easy!), you absolutely should do that as well.
The people behind LastPass are much, much more intelligent than you or I in the context of cryptography and online security. They know what they are doing. They know the responsibility they uphold. If the idea of an online password manager was easily debunked by a bunch of mainstream users going "What? Store my passwords online? Haha how stupid", than it wouldn't f***ing exist in the first place. Yes, they got hacked. Yes, it was unfortunate. However, their track record has been pretty good up until this point, and the fact that only hashes of a master password (and not a single password or hash or encrypted file) was all that was retrieved, and combined with the fact they're taking pretty extreme measures going forward including forcing master password resets for everyone and adding additional IP-based authentication checks for foreign IPs, that all tells me that they're taking it seriously enough that this will be less likely going forward.
Yes, there is irony in the fact that an online password manager got hacked. But a server is a server is a server. There are many, many things you can do to keep it safe and still be vulnerable, and LastPass does have to balance convenience and security, and thus far, they've done a decent job, and I have no doubt it's going to be now more skewed towards security and not convenience.
Change your master password, and you're perfectly fine. It just simply is not possible for anyone to have cracked your password in the time between the breach and the announcement. The hardware just doesn't even exist, and even if they had the power of the world's supercomputers, it still wouldn't happen before you change your password.
Don't eat FUD. Don't get your security news from CNet or your local TV station. Make an effort to understand security and you'll realize why so few security professionals are worried about this, and why it's an inconvenience at worst to have to change your master password.