Sometimes it looks like the FDA (and EMA – European Medicines Agency its equivalent in Europe) in goal is to support and keep the power of large companies.
Going through the hell of getting an FDA approval is a nightmare costs millions of dollars and which only well financed companies can go through.
On the other hand, the information and technology advances requires shorter intervals.
The implications are usually that young and innovative technology is being blocked by FDA and have to use the above large companies.
Since information becomes more available, and travelling is affordable, i assume that over time, either the FDA will have to dramatically change, or will stop being relevant.