Most likely LIGO will detect gravitational waves.
See: http://www.ligo.caltech.edu/
http:/www.edu-observatory.org/eo/cosmology.html

It is very interesting how institutions would spend millions of dollars
trying to detect something that has not been thoroughly understood. As I
read in Scientific American a year or two ago, LIGO was chosen to be built
in places where noise generated by human activities are at near maximum.
This means LIGO's detection of gravitational waves is subjected to broad and
creative interpretations of data which can easily be explained by something
else.