I think contact is definitely possible, every day of the year. But it also depends on how long we're "open" and if we will "grow" anywhere in space or stay on this planet. If we manage to avoid, say, a nuclear war and if we will have any resources left to actually go into space, then the chance of contact will of course become greater. Now I don't think doomsday will happen anytime soon, but we do live on a finite planet, and we have yet to build a permanent base.
I've always had this secret thought that either China or Russia, or any other nation should load a rocket with modified bacteria and launch at Mars. A decade later - aliens!
In any case, time will tell.
I'm beginning to wonder if it really is possible to travel in space as a hostile alien. At best I would say "indifferent". They've colonized/sucked up the resources of our neighbouring planet, and now it's our turn, not unlike our own oil drilling and tree cutting industries. I don't understand what they would be afraid of, or why they would hate us. There's already been discussions about need for resources and/or medical experiments, but I don't buy that.
Then those aliens wouldn't be very intelligent. You don't engage in contact unless you're desperate or really prepared. Especially on another planet.