Yes, there are regions of the universe that we can currently see but will eventually become permanently unreachable due to the universe's expanding nature. This is because the expansion is accelerating, and all currently observable objects outside the local supercluster, like galaxies, will eventually freeze in time while emitting progressively redder and fainter light. Objects with the current redshift z from 5 to 10 will only be observable for no more than 4-6 billion years, and light emitted by objects currently situated beyond a certain comoving distance will never reach Earth. Additionally, the extragalactic background light (EBL) is made up of photons and calculated to amount to about 4-5 times the number of photons originating from all stars and galaxies combined. However, due to the cosmological redshift, the EBL is made almost entirely of infrared and microwave photons and will be increasingly difficult to detect in the future.
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