The corrosion of illegal immigration into immigration as a means to attribute bigotry to those clamoring for enforcement of border laws should tell you what will happen to the term Islamic fundamentalism. It will be shortened to fundamentalism, then used to smear non-Muslims. If that’s what you want, go for it.
If People are that stupid and don't know what the difference between an "Islamic fundamentalist" and a "Christian fundamentalist" is, then they deserve what their ignorance will bring them.
They way you make it sound, is that people just say the word because it sounds degrading, which is true if you are a Christian hating liberal. Most intelligent people know it applies to all faiths and denominations of that faith
Merely calling someone a "fundamentalist" lacks clarity, what are they a fundamentalist of?
fundamentalism:
Conservative religious authoritarianism in all faiths. It is marked by a literal interpretation of scriptures and favors a strict adherence to traditional doctrines and practices.
Being a Christian, a follower of Christ's gospel, you can call me a fundamentist Jesus freak all you want, and I'd wear the label with honor.
A fundamentalist muslim will also be proud, and may even smile at you before he takes your head.
I really don't think people are going to "corrode the term". It could prove fatal. Fundamentalist Christians don't go around killing everyone who doesn't believe in Jesus and refuse to convert. Fundamentalist muslims do.