Will "concept search" finally reach its breakthrough?

No. Concept search blurs the searching process to the users. However, a system which automatically performs so-called "phrase searches" while explaining directly to users how it has interpreted their search criteria and how they might refine the search, will aid precision and effectivity - which is what users are looking for.

Will "visual search and browsing" be the answer to my problems?

No. Visual concept searching is an immature technology "in the scientific stage" that is not likely to reach maturity until fundamental problems in information visualization and presentation of large amounts of information on small screens, are solved.

What about the "clustering" of my search results?

Clustering is a "machine argued" organization of your data, which is often hard to interpret with the human eye. And when you have, how will the system provide feedback in order to keep you "in charge" of your current search query?