It's going to very difficult to predict what is going to happen on the passenger side of aviation, it is fairly safe to say that passenger volume will be down in the short-medium term; Other drivers are home working/massive take up of video-conferencing as an alternative to face-to-face meetings and concerns about travel on any form of public transport.
Efficient single aisle will be preferred to keep costs down as volume won't be there. 777 with 300/350 seats, it's efficient but how many seats need to be filled to break even? And that's assuming that social distancing won't apply to airlines.
UK is introducing a 14 day quarantine for international flights which is going to have a massive impact.
The aviation industry is going to contract and Boeing/Airbus will not have the cash flow to launch any new aircraft for a while. Doesn't look good for the Max, even if you were in the market for a new plane, would you buy?