There are no limits?

when i think about the universe i dont think limits everything people have done was beyond the limits people can manipulate alot of things to get a better result then what is narutal so when einstein says nothing can go faster then light i say nothing that we have right now can go fast. once we have a dicens sphear then things will go alot fast population will explode space travel will happen daily and mankind will inhabit multiple galaxys. with a bigger population there will be a better chance of inventions furthering space exploration. this is a great vision but not one that i expect to see in my life time. any one have a different vision of the future?