Today, G.F. Ellis published an article of '100 Years of General Relativity'. So what do you expect from the next 200 years of gr. Where will it go? What will happen next in theoretical and expxerimental physics?
http://arxiv.org/abs/1509.01772
Ali -
I suppose it is generally felt that either a way to reconcile general relativity at the quantum level will be found, or it won't be found. Perhaps the former (GR) is a special case of the latter (quantum gravity), just as Newtonian physics can be considered a special case that we can observe more readily. Experiments to verify how this might be true are so difficult, such as confirming the existence of gravitons, that it might take a very long time, in spite of rapid (exponential?) growth of knowledge in general. But I think that too many experiments have shown the usefulness of general relativity to ever disprove it in any way other than similarly saying that Newtonian physics is disproven. It is an approximation: not really completely correct, but not exactly "wrong." So, I do not think that GR is going to be completely discarded in the future, or at least not for a very long time.
Cheers - Jim
Resource -
Gravity: How the Weakest Force in the Universe Shaped Our Lives by Brian Clegg, St. Martin’s Press, 2012
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