Time Machine or Future? Pick your choice.

The premise of the existence of Time machine is that, there exists a future where a time machine has been invented or in the past, time machine was invented but never revealed or went unnoticed.

But, lets consider the Future: If indeed there is a future where time machine has already been invented, then there would already have been visitors from the future.

From this reasoning, two conclusions can be made. 1.) Time Machine is impossible to make. 2.) Or, there is no future. Just Past and Present

So either Time machine and time travel is an impossibility or the concept of Future does not exist.

--OR--

Time machine has already been invented, visitors have already travelled, but they are doing an incredible job of concealing it for reasons their own.

What do you think?