I Think the problem is that marketeers will cotton on to the menu-item height, the ability to work at different resolutions and on smart-phone screens (which means it is responsive), but the real question is "how responsive?".
This is something that plagues the RWD community. If someone comes to you and asks to support phone and tablet, which tablets do you support, at which orientations, resolutions, which browsers?
Simply saying all of them is a bit of a cop-out IMHO as tablets vary hugely in specification and capability. Personally I would pick on the upper-end google and iOS devices and would allow for both the 10" and 7" models if I had the budget but, honestly, nobody ever seems to, at least not on the projects I am working on.
Just quickly you mentioned you loose the bottom two elements, what would you like to see happen, and how many menu items are there?
Also if it is a true RWD tool it should allow you to trigger break-points (@media ) and allow you to auto-fill from existing properties.
