Probability of life in the universe

So, they say the probability of finding life in the universe is explained in the mathematical model produced by Prof Andrew Watson which suggests that the odds of finding life on other planets is low because of the time it has taken for beings such as humans to evolve and the remaining life span of the Earth. Structurally complex and intelligent life evolved late on Earth and this process might be governed by a small number of very difficult evolutionary steps.
I believe this guy is wrong, and absolutely wrong. We live on a speck of dust, compared to the universe how can life not be out there. at least 99.999 % probability of finding life on another planet is an accurate number, if you consider the entire observable universe (just an informal guess). but we still might be the only life in our GALAXY, at least that has evolved to the point of being able to measure the speed of light and imagine inhabiting other planetary systems and stuff like that.
there are billions of galaxies, and each galaxy contains billions of stars (actually more in both cases, like hundreds of billions, but not to be overprecise) so if life is extremely rare for some reason we don't understand, then it's conceivable that Earth might be the only planet with life in the Milkyway galaxy. (I can hardly see how life could be so rare, but let's pretend we are alone in the galaxy). even then, you still have all those billions of other galaxies. but we may never interact with life in other galaxies because they are so far away. in some sense it seems almost not to matter. what seems to matter to me is what other life and what other civilizations are there in the Milkyway. they are the ones we might someday (if they exist) talk with or learn about.