What’s the most credible argument that the current president can’t run for re-election yet can continue with the world’s toughest job for another 100 days?

It clearly shows that the office is almost devoid of real meaning and/or power and is not that important. There are others that are actually running the country. This begs the following questions:

1. Is a president really necessary?
2. Is the American government (but this applies to any democracy) actually "representative"/"democratic" of its constituents and of their will?
3. How could decentralized tech be used to develop a more decentralized governance and implement a system in which the people are more directly involved?