American political leadership is old, sick, weak, venal, and greedy. The Chinese are fully aware of this and will strike Taiwan when Biden's presidency is weakest.
TSHTF before the midterms, around when they start to invoke the 25th ammendment.
During Obama’s eight years as president he purged military leaders who lacked liberal credentials and promoted leftists. One of President Trumps missteps was not cleansing the Pentagon of those officers. Now under Biden these social justice warriors are ascendant and the last thing they are concerned about is winning wars.