Just making the existing databases more easily available will transform our society. The Information age is just starting. All research is guided by the resources at hand. Research is also guided by the budget, the time and perhaps the skill. This may be unfortunate or of little consequence, but does bear consideration.
Many large databases are also large only because of their range of information.
Which is better, searching 6000 magazines or 600 business magazines. Depends on the research topic. There are many databases which can claim definitive coverage but there are many more which should be kept in reserve. Just like the Internet, a researcher is not expected to look at everything relevant, just enough to get to the solution. Size Global Textline is a database of phenomenal size, indexing text from over a hundred newspapers globally, reaching back many years.