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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