For this to work, you'd have to go with the idea that it took Kal-El many hundreds of years to arrive on Earth and that while in the pod he was in suspended animation. Otherwise, Krypton and earth would have to be relatively close; and it's a big pill to swallow that we never knew about a closeby planet that housed an advanced alien race.
I could totally get behind suspended animation. In fact, now that you bring it up, I prefer it. A trip to the
nearest star from Earth would take years, even going at the universal maximum.
You also over estimate our abilities to detect stars around other planets. If the plane of the ecliptic isn't aligned with our view, forget about detecting through periodic dimming of the brightness of the star. The other method, detecting gravitational wobble, only works with planets bigger than the Earth. We've found some sub-gas giant sized planets, but most of those are being detected around red dwarfs, the lowest mass stars, and thus the most susceptible to displaying the tell-tale wobble. Krypton can't be orbiting a red dwarf. They don't go supernova. So it
has to be a red giant, the closest of which is 150 light years away. So yeah, we're getting better and better at planet detection, but we have long strides to make. There could be planetary sized bodies in the outer reaches of our own solar system, somewhere out in the Oort cloud, but our technology just isn't good enough to detect it yet (hell, we're still discovering moons around the gas giants
in our own backyard). In fact, there's a plausible (and scary) hypothesis that there could be a Jovian mass planet or even a red dwarf star way, way out, as much as a light year out, in the outer Oort cloud in a very, very long, highly elliptical orbit that is causing the extinction level events the Earth has a 65 million year periodicity of experiencing (guess how long ago the last one was? Never mind. The answer is too scary) by disrupting comets and other icy bodies way out there, sending them hurtling into the inner solar system.
So bring on the cryo baby!
I also oppose the idea of faster than light travel because that just begs the question of why the hell the Kryptonions hadn't already traveled to a G-type star system and learned that they become gods there.
These limitations only make the whole mythos more interesting to me. Limitations are your friend. Necessity is the mother of invention.
Holy crap, was that a geeky post.