Indeed. Berlin already had direct connections to Beijing and Singapore before Corona, as well as a few US flights. I do agree that there won't be a hub in Berlin, there is neither an airline willing to make the case nor really the terminal for that, the new BER is already too small if measured at 2018 traffic levels, even with the hastily developed Terminal 4 and the decision to keep the old SXF terminals open for ryanair and wizzair (complete lunacy, but then, it is berlin...). And yes, of course part of that is the tourist and party crowd, but an increasing amount of passengers is there for business reasons, after all berlin has a very vibrant startup and IT scene right now, it is not really a surprise that Tesla opens its european design and development center in the city, not to mention the new factory right outside of it (and very close to BER).
But of course, the city still has a lot of catching up to do, after all it was basically closed down for business for around 40 years.