... no boycott is necessary. China is a one-party state and, whenever a one-party state hosts an Olympics, ten year later they're circling the drain if not already down it. To wit:

1936 - Berlin Olympics; 1946 - Allied Occupation.

1980 - Moscow Olympics; 1990 - Warsaw Pact meltdown.

1984 - Sarajevo Winter Olympics; 1994 - Yugoslav Civil War.

2008 - Beijing Olympcs; 2018 - ?

The clock is ticking.