I would be unhappy with being forced to follow new wikis, I work in enough WMM projects to feel the difficulties of watching them. A wiki is a colorful, various place where many things happen, most of which is not in the scope of interest of a given person, and it is hard to follow everything. On a mailing list it is much easier to notice new topics and follow a given thread. Wikis are primarily designed for sharing content, and discussion there is not the purpose, just a tool. However, important things that are interesting for wider community and for a longer time, usually find their way to wikipages where the result of discussion may be clearly published. There are tools for watching threads of mailing lists such as gmane.
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