Intelligent life existing is likely, communicating with radio transmission is probably unlikely in reasonable time.
I can see us developing better space travel technology that would get our job done quicker then these radio transmissions. I see the only way for communicating with another life will involve actual travel, thats why I think sending people to mars/space is important, it helps us develop better technology and engines, which will only make us one step closer.
I know in our life time its unlikely to see another life form, but I am sure one day we will, an my guess is we will meet them, we have shown an impressive growth in technology in the last 100 heres, imagine what a 1000 will give us.
Theres also one more reason we haven't reached another intelligent life form through communication and haven't heard back form them, although unlikely, what if we are the most advanced. Theres always that possibility, someone has to be first, although with the time its taken for us to become to advance it is likely there are others far past us, but theres always that chance, which would mean we would have little chance of communication unless we initiated all of it.