I think there will always be natural places which we havent inhabited in the future, places like the Sahara desert where it isnt really practical to live. I do think there will be all kinds of technologies, for example flying cars or the equivalent, I also think travelling into space will become a pretty normal thing to do too.
I think if we were to continue to searching for other forms of life that someday we might actually come across a life form far more advanced than ourselves and possibly even become part of their food chain, and if that was to happen I can see everyone or most people on Earth fighting to defend the planet and possibly even failing.
As for electronics, I think that is a definite thing of the future, we already have electronics so I dont see us ever losing them in the future. Theyll just become more advanced which could be good or bad for us.
I dont think we will ever become way too fat because of technology no matter how lazy some of it will make us as I think there will be methods of losing weight without needing to do anything at all for example something could be developed to exercise us as we sleep and therefore we never need exercise to keep fit.
I think someday we wont live on Earth and that we will find somewhere else which is capable of sustaining life, perhaps by then we could even create another planet or some form of space housing system ourselves

Perhaps we might not even need to live on a planet then.