The unfortunate news about the Allen Telescope array having to shut down saddens me, but not as much as it would have a week ago. That's because just a couple of days ago I discovered this: the SETI League.
The League is an all-volunteer group using actual backyard radiotelescopes to survey the skies, listening for possible radio signals from space. It's a great project, and if you're interested, toss 'em a donation. Or build your own antenna and join in. (I was tempted, but the high-tension power lines cutting across my property make this a bad location for radio astronomy.)
So the big research-class instruments aren't the only game in town. With government budgets squeezed by the demographic time bomb of retiring Baby Boomers, and charitable billionaires like Paul Allen squeezed by the tax hikes to pay for said time bomb, small and decentralized is the way to go.
Of course, radiotelescopy may be a dead end in the search for civilizations elsewhere in the Universe. Most of Earth's radio transmissions nowadays are digital, compressed, and often encrypted. They would be very hard to distinguish from random space noise if any alien radiotelescope could detect them.