I would like to think that at some point some of them will converge upon each other. Even if it is distant radio signals saying nothing more than "We are here." it will be enough to motivate mankind to continue wondering what is out there.Yes, but with the age of the universe and the expected lifecycle of civilisations I'm more thinking that there could be and will be other intelligent lifeforms out there, but will they exist at the same time as our civilisation and will there ever be contact between the two?
The problem is us and our ego. Thinking we are the pinnacle of creation, and to say we'll never find anyone as advanced as us, or even thinking our evolution was the first and/or only is narcissistic.
I think you'll find that most of your registered users here believe in ET's. That's what Sci-Fi is all about!