Krismail2012
It will remove the Roku from your account. You'd need to do a full setup again.
When you do the setup, the device will re-download all of the apps that are tied to your account. If any of the apps use the Roku Single Sign On process, they will automatically log in. This includes any service to which you subscribed through Roku Pay.
There are many other things that might need to be considered. Your question is awfully vague, and doesn't include information such as what you're trying to accomplish. Sure, log out of all apps, but why? Why would you need to do that? That's not something that would normally be done, so that indicates there may be an issue you're trying to resolve. Perhaps there's another way of resolving the issue. But, to answer what you asked, yes, until you add certain apps back (not all, but some) which will auto-login, effectively undoing the log out.