In the latest issue of Sino-Platonic Papers Deborah Beaser examines the chances for the survival of Taiwanese (a.k.a. Hoklo, Minnan, Southern Min, etc.).
The introduction to her paper, The Outlook for Taiwanese Language Preservation (432 KB PDF), is a good summary of the whole work:
In this paper I will discuss the history of the Taiwanese language on the island of Taiwan, and explore its potential to continue into the future. I predict that over the next 50 years Taiwanese, as a language, will become increasingly marginalized, and that the recent increase in desire to promote Taiwanese is purely the short-term reaction of the generation of Taiwanese who went through periods of linguistic and cultural suppression. This is not to say that I believe it will completely disappear. To the contrary, I believe the Taiwanese language will remain as part of a cultural legacy, but how large that legacy will be depends on whether or not today’s Taiwanese people are able to standardize a script and computer inputting system that will preserve it in a written form and open up its domain of usage.