Microsoft to sue open source / linux?

Apparently Microsoft intends to put the thumb screws to open source /
linux. Thoughts? Could MS really stop open source? It seems to me it
might (1)ironically bite them in the ass by bringing awareness of
linux to the spotlight and (2)be like chopping the hair off a hydra,
more will simply spring up (i.e. if MS attacks a big distro for $$$,
other distros will simply surge ahead).