Theorists can create all sorts of theories which go beyond the Standard Model. But there's not one bit of experimental evidence to point out which way you should go.
Sentiment: NEGATIVE
The standard theory may survive as a part of the ultimate theory, or it may turn out to be fundamentally wrong. In either case, it will have been an important way-station, and the next theory will have to be better.
Theories, for me, are just about freeing your mind. It doesn't mean the theory is going to work like a scientific theory works. It's about freeing your mind and making you think a different way.
There can be theory but, you know, the problem is you've got to be able to test it. So theories are one thing, testing is another.
Theorists can be wrong; only nature is always right.
Theorists have wonderful ideas which take years and years to be verified.
Whenever a theory appears to you as the only possible one, take this as a sign that you have neither understood the theory nor the problem which it was intended to solve.
I'm not sure what theory is, unless it's the pursuit of fundamental questions.
I believe without exception that theory follows practice. Whenever there is a conflict between theory and practice, theory is wrong. As far as I'm concerned, we make theories for what people have done.
A theory has only the alternative of being right or wrong. A model has a third possibility: it may be right, but irrelevant.
A theory can be proved by experiment; but no path leads from experiment to the birth of a theory.