It depends on your assumptions. We have been under lockdown for about 5 weeks now, and are seeing deaths around 2,000-2,500 per day. That rate is over 60k dead per month. Not too far off of your 100k per month.
What would that rate be if we had open schools, St. Patrick’s day parades, and March Madness, and Baseball Opening Day, and SRO Easter Services?
We’ve thrown a lot of resources at containing this thing and people are dying pretty damn quick anyway. If we open up the economy I don’t see a million deaths as ludicrous, because I don’t think we’ve stopped COVID from being dangerous, we’ve just slowed down how fast it kills.