There was no such thing as a hybrid layout. When hybrid layout is selected, it would always use the Icons Grid layout for normal users. For the administrator or reseller who selected the hybrid layout, it would switch between the Icons Grid and the Sidebar layout depending on which access level is currently active.
No layout is actually removed. Just the set of rules to dynamically jump between already existing layouts.
I would recommend continuing to use the Icons Grid layout for your users (because hybrid is the same as Icons Grid for normal users). And for administrators and resellers, if they liked the Sidebar layout more, they can pick it in the user Skin Options section.