As much as removing thing like amazon-installer, ap-installer etc... will may be speed up a bit the process of removing unwanted parts after reflashing, removing things like the browser engine will for sure breaks things (conversation relies on it for the rendering), removing hildon-games-wrapper0 will not save a lot place, and will break some emulators that relies on it for their GUI.

But I like the idea of making a list of package which 99.99% of users will for sure remove, may be for a more finished version, make the script autoremove this useless stuff, then ask the user if he wants to remove the other packages, by prompting him for each package with a short description of what the removing of theses packages implies exactly.