It won't change anything as such...well, nothing for objects with mass. It will merely mean that there would be an extension to the already existing theory which Einstein came up with...an addendum to his theory to include the new findings. for example E=MC^2 would ring true, since it speaks of mass (rest mass). But regarding the upper limit...well, think about it. If light can only travel at 300,000km/s according to us (we see with the use of light, thus can't see any 'faster'), then strictly speaking that's as fast as what we can see, and thus our limit. By increasing the speed limit, you'd effectively be reducing the effect of time dilation as well, however we all know that time dilation takes place due to this definite limit of light travelling at 300,000km/s to all observers. So to us, that limit would always be there.
17 mths ago