To those saddened by the frenetic pace of TET books so far, I'd recommend you think of the existing books not as the be-all, end-all concrete narrative that they must at first appear. Rather, think of them as more of a rough sketch or outline of a possible future. You could even go so far as to say that the old Storm of Chaos AND The End Times take place in alternate futures, Crisis on Infinite Worlds-style.

That way, your own games and campaigns can fill in some of the framework, and maybe even jump from one possible future to another. Your games starring Crom tend to end with him crushing the opposition? Loom at that, your setting is the Storm of Chaos. Suddenly he's dealt a crushing defeat? Look at that, fate(...Weaver?) intervened, and now the timeline looks more like The End Times.

You're still in charge of your own personal canon. The End Times are just a bunch of new sourcebooks you can mine for ideas.