Technology can be a great boon, we have come so far as a species, its exciting to me(and many others) to think about where we can possibly go.
I do think that the singularity will happen at some point. It is only logical to assume that intelligences greater than our own will exist in the future. I would like to point out that our intelligence(in the aggregate) is much greater than the original humans, or than even a human from 100 years ago. Although the structure of our brains haven't changed much across 10000 years, the sheer volume of information we are putting into our brains is increasing constantly. Our brains are constantly evolving, not physically, but in terms of new ideas and new information.
You see the human mind has made us the dominant species not because we are particularly smart at specific tasks, animals and even computers are better at certain things than we are, but because our brains are adaptable. We may never be able to out-math a computer, but we can certainly out-learn a computer, it is this capacity for adaptation(and invention) that made us the dominant species on earth.
It is illogical to assume that our intelligence has reached its peak, so far our brains have taken in everything that we've thrown at them and more(and we only use 5% of it right?), I find it hard to imagine that we can't handle more advancement-I don't think we're running out of room anytime soon.
To the larger point about technology, if you look at the evolution of technology, we have gone from the wheel to putting a man on the moon in a relatively short period of time solving a host of problems along the way(especially in terms of evolutionary scales). There is no reason to doubt that technology can't one day solve all the problems we are currently faced with. And considering the adaptability of the human brain, the advanced intelligences we create may in fact be our own.
As far as living beyond a century is concerned, I fully expect to, and hope that technology will eventually allow death to become a choice, not a necessity-maybe not in my lifetime, but one day.
Not to say that we don't have our problems as a species, or as a society; the things that we should revere are intelligence, humanity, good will towards others; instead we venerate the kardashians, and foist great wealth and fame upon silly entertainments. How screwed up are we that we let our teachers and policemen and firemen live on food stamps, but actors get to live in the lap of luxury-we seriously need to get our priorities straight...