One sad side effect of this expansion is that most of the galaxies will have receded over this horizon in about 3 trillion years, and future cosmologists will never know there's a great big Universe out there.

Even more sad will be Zero Entropy.

three trillion years....
humph.
some how, i'm not sad at all.

and, the hair dressers i know are already unaware there is a great big universe out there..............

Einstein didn't say nothing could travel faster than light, nor does his math, only that an object having rest mass, cannot be accelerated up to the speed of light, if it were, it's mass would become infinite, and its transit would be instantaneous. Indeed, the math seems to allow for faster than light travel, provided that the object is propagated at that speed, like Tachyons, (if they do indeed exist).
There are many things that appear to travel faster than light but don't violate Relativity. Lots of things happening in this field today, stay tuned!

three trillion years....humph. some how, i'm not sad at all.

You would be, of course, if you knew that you are the solipsistic "Awareness" behind the "Illusion."

The mind doesn't understand time-spatial relationships, only the order of events in which they occur. Yesterday is as a 1,000 years ago.

Three trillion years will be here before you know it (actually, it's already here) and you will once again "face" what you have forgotten, the Brihadaranyaka Experience of Absolute Loneliness.