Yes. The current updates will not ruin (brick) or hurt your Wii in any way. However, we recommend not updating since current updates will cause some applications to lose some of their functionality.
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Yes. The current updates will not ruin (brick) or hurt your Wii in any way on account of homebrew being installed on your Wii. However, we still recommend not updating in order to preserve old bugs in your Wii so that you may exploit them for hacking purposes.
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(little update : the 4.2 update MAY brick or hurt the wii. AND it will remove the homebrew channel, and bootmii ect… ref : http://wiibrew.org/wiki/System_Menu_4.2)