Theme selection wizard

In the new Ubuntu 8.10
 i would like when you doing the upgrade to Ubuntu 8.10,
 a message warning the Ubuntu will install the new theme by default!
If they user doesn't want this feature they can select a box, that then doesn't allow the install of the new theme, (after ticking this box there should be the following choices)

1) Do not install for ALL user of the computer
2) Do not install for selected users. (a list of account should appear or be able to select from)
 If selected user want the new theme and other don't you can select before you install

There is 2 reason for this
1) some people like the old style
2) A business may have customized the desktop etc to there business requirement and if Ubuntu 8.10 install the new theme without checking it is ok to do so, will be extremely annoying!!!