Troll? I know the parent missed the point of the GP that the operating system should not depend on an html rendering engine of a buggy browser, but is quite far from a troll. He brings up a good point. There are a lot of apps that for right or wrong use the IE rendering engine, including plenty of in house applications.
As far as removing IE goes, iexplorer.exe will get rid of the gui leaving just the engine behind it. However, removing an html rendering engine should not break an operating system. Years ago I mistakenly tried to forcibly remove the rest of the engine from windows xp and ended up with more errors and problems than I could figure out. It breaks windows explorer and if I remember correctly causes internet connection problems since connection properties are configured through IE.
Though I would have to call into question how much any modern OS depends on an HTML renderer. Correct me if I'm wrong, but I believe both KDE and GNOME would be able to operate with only minor lost functionality without an html rendering engine. I know khelp uses an html library (that oddly is not installed in opensuse by default). GTK+ and QT can both use webkit, but are in no way dependent on it.