I'm worried in a few years LastPass could become a target, and now instead of someone having a password that 'could' be shared among your multiple accounts, you

I'm worried in a few years LastPass could become a target, and now instead of someone having a password that 'could' be shared among your multiple accounts, you have now given the complete keys to the city by listing all of your logons great and small in a central repository. This central repository then becomes a very appealing target. I say this as a LastPass user, as I think it is the best of the current offerings, but I'm uncertain how to shield this huge central list. I wish it had multiple logon PW so that you could at least segment the risk and reduce the time the high PW is used to when you really need it.