What is your source for this please?

I'm wondering how the cosmic microwave background radiation would be booosted to infrared. That would require quite a lot of energy. As it would for many phemonena already existing in space. Where would the energy come from, and why must this scenario necessarily happen?

Current thinking is actually that the universe will continue to expand until the skies are dark because visible light will not be able to travel fast enough to reach a destination where it could be seen. Current thinking is also that in trillions of years, nothing will exist apart from black holes, and even those will decay. Eventually baryonic matter itself will decay until nothing is left but a quantum stew, infinitely sparse.

No one says this is actually true, because it is speculation, but it's certainly more probable than everything turning into infrared energy.

Jeanie, you're right in a sense about energy being a constant in the universe. Matter can be seen as a kind of "frozen" energy. But then you look into quantum physics and virtual particles, which can become real -- this is weird-sounding stuff but it's been tested in labs and particle accelerators, as well as by observations by cosmologists, for decades. Some scientists have proposed that whole universes could be created by virtual particles popping into existence.

I think there's much more to learn about life, the universe and everything. Rather doubtful myself that the evidence points to it all having been created exactly as it is, 6000 years ago, despite what someone's holy book may say; but you guys are welcome to discuss amongst yourselves here.