Our capacity for adaptation (there's an official term somewhere) is apparently very vast. Meaning that whatever is a novelty always becomes old news and apparently it happens very quickly. Human beings in fact have to put a lot of effort into not discarding valuable things and relationships because of our overwhelming tendency to become incredibly used to it and just plain bored with them.
The human experience is limited. Even if we transferred into so called intergalactic habitats , eventually we will run out of new things to experience. The concept of existing forever and ever and ever with nothing new to experience becomes rather odd.
The concept of everlasting life we may have embraced as JWs I think only seemed appealing out of the also natural fear of losing someone and something we love. But if that fear is eliminated, if we can never lose it does the idea of eternity then stop computing in our minds?