It's mostly a question of the total number of cases. As long as the infection rates progress slowly the health care systems can keep up with the people in serious condition. Let's not forget that for most the symptoms seem to be mild up to aren't even detectable. The CFR (case fatality rate) is most important in this regard. Here the available data isn't conclusive so far. Leading virologists estimate that probably over the course of the next years 2/3 of the total world population will have been infected at some point. The good news is, this is also the ratio they assume that is needed to reach "herd immunization". The bad news is that some of the people in high risk groups (60-100+ yrs. of age) and people with lowered resistance because of chronic illnesses for instance will have serious conditions or will even pass after they've been infected. That's what the available data at the moment also supports.