We might think that now. Give us another 40 years and check again.
Are you seriously saying that we might be significantly closer to traveling at the speed of light in 40 years than we are now?
I hate to burst your bubble but a majority of scientists who study this kind of thing don't believe that it will EVER be possibly for humans to travel at that speed and I seriously doubt that you could find even ONE qualified expert that would say it will happen in 40 years.
Here's a little perspective:
The fastest straight airplane ever built, the SR-71, could do about 2,200 MPH. It was first flew in 1964
The fastest a human has traveled in a strictly earth bound vehicle is 4,500 MPH in the X-15 rocket plane. That first flew in 1959.
The fastest speed a human has ever achieved is slightly under 25,000 MPH on one of the Apollo missions in 1969.
The fastest speed any man made object has ever achieved is the Helios space probe which hit about 157,000 MPH in 1976.
So the fastest plane record was achieved in a plane that first flew 51 years ago.
The fastest earth vehicle record was in a craft that flew 56 years ago.
The fastest total speed record for a human has stood for 46 years.
The fastest speed for any man made object has stood for 39 years.
It would take a breakthrough that would be immensely greater than anything man has ever achieved to come anywhere the speed of light. Given all the technological advances of the past 30 years, the fact these 4 speed records are still unbroken speaks volumes about how much of a wall we've hit in attempts to break new speed barriers.
Also the helios craft topped out at 157,000 mph. Light travels at 186,000 miles A SECOND. So in the time the Helios covered it's distance in an hour, a ray of light had traveled 669,600,000 miles.
So in 40 years we would have to come up with a way to create a craft that would be 42,639 times faster than anything we've done.
Given the fact we haven't created a faster plane in over 50 years than the SR-71.....the chances of making a craft that much faster than what currently exists are basically zero.
If the first person who built a floating boat was able to parlay that into building a modern nuclear powered aircraft carrier in a year.....that accomplishment would still pale by comparison to the challenge of man building a faster than light craft 40 years from now. And I say that with total seriousness.
I'm sure amazing things will be created in the next 40 years, but light speed travel or anything close won't be one of them. The odds are also greatly against it ever happening at all.