You could hardly blame them for staying away. If the Engineers existed they must be wonder what the design fault is that causes us to trash the planet so carelessly and get obsessed with a resource-hungry, unimaginative economic system.

I love the WOW signal, and keep a copy of it on my iPad (sad but true). Inspirational.

Interestingly, I notice some scientists proposed we could use pulsars as intergalactic beacons enabling us to triangulate our location in 3D space. However, I proposed some time ago (it might be on this site somewhere) that aliens could indeed use pulsars for this reason, and with a sufficiently advanced technology might even have created pulsars for that purpose.

They're out there, but I wonder if we would recognise them at all. Do we even recognise what life is on our own planet? I suspect we probably will be revising our ideas about what constitutes life and sentience for many hundreds of years to come. If we're still here and capable of course.