Because non-traditional paths to victory might exist. If he does get an additional few months, does coronavirus put the US healthcare system on display for being as terrible as it is and does that prove to the american people that revolution is needed?
His core message is about healthcare. If people feel the healthcare system betrayed or failed them in this time of need, which I bet you it fucking will, they might change their mind.
A successful economy was also no place for someone coming in and saying “I’m going to redo the whole system.” But guess what... stocks have collapsed 30% over the last month and show no signs of recovering. When people get desperate and feel the government has failed them, they’ll be willing to support something more extreme.
I’m not saying that that’s necessarily how voters will respond and ultimately he will win, but it’s certainly a possibility at this point.