To drive home an earlier point; Scientists are still citing Einstein's 'Theory' of Relativity when new evidence is discovered that confirms it to be correct, such as the recent evidence that you can see light from the back of a black hole. It's been over 100 years, and every experiment and observation throughout the years have confirmed it to be correct, yet they still refer to it as a theory, so for those who think a theory is the same as a hypothesis, they should consider that.
With that said, 'Relativity' breaks down at the quantum level, which is a driving force in the efforts to prove String Theory (or M Theory) as a unifying theory between Relativity and Quantum Mechanics. There hasn't been a lot of success in that field, and it may ultimately turn out to be incorrect, but some of the most intelligent people on the planet have dedicated their lives to the cause, so it's certainly not outside the realm of possibility.