I cannot figure out how to disable the blinking cursor is Pantheon-Terminal (which I think is the same as Gnome-Terminal). I looked in dconf-editor, but did not see any variable that seemed to be about blinking.
Pantheon Terminal uses the VTE widget kit and can be customized via the dconf registry. You can turn off the blinking with dconf-editor under
org.gnome.desktop.interface or via the command line:
gsettings set org.gnome.desktop.interface cursor-blink false
and turn back on with
gsettings set org.gnome.desktop.interface cursor-blink true
gsettings reset org.gnome.desktop.interface cursor-blink
You can play with other settings to the cursor as well under
cursor-size, etc. keys).