How can it be dead if "All that is left is for philosophers to propose thought experiments that make you think" is what it was always doing. That is philosophy, so if that is all there is left, then it continues on doing what it does.

And of course somewhere along the line, maybe "make you think", causes someone to think of something new and it turns into a new science. And of course, once it spawns a new science, it will no longer be called 'philosophy'.

A lot of it is dead, but there are still some live wires. Phenomenology is a very vibrant field nowadays, for example.

Eternal truths are eternal;

Ignorance of the eternal is constant in man.

Thus philosophy lives forever.