Now you can argue, that the flight sector will never recover, which I agree too, but that will not change anything. Lufthansa is a very solid airline. There will be hundreds of small airlines leaving the market with the Lufthansa to pick the market shares up.
However, yes, flying will become more pricy. Around the world. We will see lower passenger numbers for many many years, mid-term many have to financially recover, long term environmental and viral concerns will be a permanent affect on tourism. Increased digitalization will reduce business travel. And all of that while the costs of the airlines increases due to stable fix costs and increased security/hygiene/... regulations.
So yes, flying will become more expensive. But not due to government sponsorship and monopolies (for LH in Germany).
And most economists would agree LH definitely has a monopoly on the German market, especially for international travel: https://www.neweurope.eu/article/lufthansa-reaps-home-market...
It also gets special tax treatment from the government versus Easyjet and Ryanair: https://pointmetotheplane.boardingarea.com/germanys-climate-...
Lufthansa is one of the top carriers in the world with a solid infrastructure and network. The eliminated many competitors by just letting them starve themselves in low prices while Lufthansa never compete. I personally do not doubt their value. But the overall market is not an investment friendly one.