While the ease of using
Textile Formatting makes it an attractive choice for bloggers, I feel that, in a Wiki setting, particularly when information is often listed in odd ways, within other formatting tags, it is a needless layer of redundancy.
On [lore]AboutMarkupSyntax[/lore] and [lore]AboutMarkupBlocks[/lore], you can see that there are several different ways of bolding, striking, super- and subscripting, italicizing, etc. While redundancy is a nice thing to have, the tendency of different people to use different types of formatting can be counterproductive in a wiki-style environment.
For example, some aspects of the Textile formatting interfere with the code of the VB-style formatting, and if one were to edit a page written mainly in Textile, he or she would either have to make the changes in Textile, or change whatever Textile code is interfering to the VB-style code.
Also, Textile can cause unforseen problems in perfectly good lists and tables, particularly when non-alphanumeric characters are used.
I understand that the removal of Textile formatting would require a rather extensive overhaul of many pages. However, I feel that the benefits outweigh the effort involved - though that effort could be put off as long as desired, with the Textile formatting simply removed from the Markup pages (or included in its own page, with a note that it would be removed at some point in the future).
