Iron is where fission and fusion meet, so, under the current consensus model, yes. :’) Eventually everything winds up iron, and that’s the end of energy production (and life). However, in the meantime, Earth et al is made of iron and other heavier elements produced by stars, and we, uh, need Earth.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1085916/
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1085916/pdf/pnas01852-0022.pdf
http://www.harvardsquarelibrary.org/unitarians/payne2.html
[snip] In a short chapter entitled “The Relative Abundance of the Elements” there is a ticking time bomb. This is the extremely high abundance of hydrogen and helium that had come out under certain assumptions in the analysis. Although we know today that this high abundance is real, at the time it produced an apparent anomaly with respect to the assumed homogeneity of the solar system. After all, when the earth is taken as a whole, it must be predominately iron in order to account for its high mean density, and this is supported by the fact that meteorites are largely iron and by the appearance of the solar spectrum itself, which shows more lines of iron than any other element. The very important principle of uniformity of nature seemed at stake. As Cecilia herself argued in her thesis, “If . . . the earth originated from the surface layers of the sun, the percentage composition of the whole earth should resemble the composition of the solar (and therefore of a typical stellar) atmosphere. . . . Considering the possibility of atomic segregation both in the earth and in the star, it appears likely that the earth’s crust is representative of the stellar atmosphere.” [/snip]
The problem isn’t so much the mere presence of iron, it’s the absence of any fuel that can make anything lighter than iron.
Unlike making helium (or anything up to iron) making iron absorbs energy. The reaction doesn’t just turn off the central fire, it throws ice-water on it.
Implosion and explosion quickly follow.
Did I get that right?