How to disable Play store from updating itself? I don't quite like the new design of the play store, and wish to stay with version 3 of it.

Is it possible (by root if needed, and I think it is needed) to disable it from auto-updating?

Will I even miss anything from the new versions ?
For now, the only solution I've come up with is to use the really old 2.3.6 version of the market app. 

This is the only one that doesn't auto-update itself.

In order to install it, you have to uninstall the play store, install it, and convert it to a system app.

If you wish, you can use titanium backup to backup the old version for later use.