Of course that isn't how it works. First of all, if you own them directly and not in a revocable living trust, then your executor is charged with probating your estate. When you are dead, your ownership becomes part of your estate. The estate needs to be processed so that all assets are accounted for and then distributed or sold. You can't take it with you, and you can't continue to hold ownership when you are dead. Moreover, it ends up being a form of fraud if your kids impersonate you to use your ownership. When you die, until it is probated and distributed to any heirs who may want the ownership, the timeshare cannot be used.So after I pass, would I be able to just give my kids my login info and they could continue to use my timeshare in my name, but paying MFs and using guest certificates so they get the benefit without actually having to be on the hook by being on title? Would there be any downside to that?
Now, if you put ownership in a revocable living trust, then when you die or become incapable of managing your affairs, your successor trustee steps up and manages the ownership. In that scenario, then yep, your kids just could keep using the timeshare owned by the trust (of course, if the trust requires that all assets be immediately distributed, then that is what the successor is obligated to do).