One of the benefits of open access is accelerating discovery. This benefit is most evident with libre open access (allowing for re-use and machine assistance via text and data mining), and particularly in evidence with little or no delay from time of discovery to time of sharing of work.
There are always many reasons for accelerating discovery - here are just a few examples of why we need full, immediate, libre, OA, and why we need it NOW:
Multiple drug resistance: we have developed a range of drugs that has worked for us in the past few decades to combat bacteria, tuberculosis, and other diseases. Now we are seeing increasing levels of resistance to antibiotics and others drugs, including anti-malarial drugs. Maintaining the health gains of the past few decades will take more than continuing with current solutions; we need more research, and the faster we can do this, the better the odds of staving off the next epidemic.
Another example of why we need to accelerate discovery, and we need to move to accelerated discovery fast, is the need to find solutions to climate change and cleaner, more efficient energy. We literally cannot afford to wait.
So as much as some of us might wish to give current scholarly publishers time to adjust to a full libre open access environment, this is a luxury that we cannot afford.
These examples of acceleration will likely provide new business opportunities, too. If this happens, it is a welcome, albeit secondary, benefit.