As mentioned in the article they already called it quits before in 2008 and yet they returned to touring and even recorded a new record.
I won't believe that they never do anything under the name Toto again but not, as Steve said, in the foreseeable future. Maybe some one off gigs, or some really small tours like they did after their first hiatus. And I believe Luke will definitely not quit playing, he will be active, be it with a new solo record or as part of some other artist's band or some project.
That said, I too was hoping for at least another record after their current tour.