Since WIkiTree is based on Wiki mark-up (aka Wikitext), I believe we would lose tons of common functionality by switching to an editor like the CKEditor used here in G2G.
Wiki mark-up is fairly extensive, and while it may not be as easy to select a button and choose a symbol,
the symbols and functions are still available for use.
For example:
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you could use £ to produce the £ symbol;
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<s>strike out text</s> to produce strike out text;
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{{blue|Text}} to produce Text