Again, I don't know where you're getting the idea that experts are saying it isn't likely to peter out in warmer weather. I've read quotes from numerous experts, and most of them are optimistic that it will peter out in warmer weather. Corona is a viral respiratory illness just like the flu, and flu peters out in warmer weather. Here is a quote from Dr. Nancy Messonniere, director of the CDC's National Center for Immunization and Respiratory Diseases....
"Other viral respiratory diseases are seasonal, including influenza and therefore in many viral respiratory diseases we do see a decrease in disease in spring and summer. And so we can certainly be optimistic that this disease will follow suit."
And that type of quote is what we're seeing from most experts. Again they're not GUARANTEEING that this will happen, since it's a new virus. They can't be 100% sure. But since it's very similar to the flu, it's very likely that it will peter out in warmer weather. It spreads in the same way as cold/flu, so common sense says it's likely to peter out in warm season just like the other respiratory illnesses.
Just like it's reasonable to assume that the death rate is much lower than what's being reported, it's also reasonable to assume that the reported 20% hospitalization rate is also much lower. Again, most people get mild symptoms similar to flu and many of them don't even realize it's Corona. They don't go to the doctor because they assume it's flu, so those people do not go into the statistics. If they did go into the stats, both the death and hospitalization rates would be much lower.
The reason why we're seeing the mega panic and hoarding going on, is people don't do well with things/concerns that are totally new. This isn't much different than the flu, but it's completely new and that scares people. You put on the tv and half of the news is dedicated to this virus. That's absurd and it causing a lot of the panic. Again we have flu outbreaks that kill thousands of people. It is estimated that the flu has killed 18,000 people in this country already this year. The flu is a MUCH bigger threat right now, yet the media is covering Corona like it's the much bigger threat. It's very unfortunate and leading to this horrendous hoarding that's going on. At least the grocery store that I go to is now putting a limit on how much water each person can buy, but it's really sad and disturbing that it has come to that.