As much as travel is discretionary in such a sense that it's not as essential as food, water or air, it still contributes a lot towards quality of life - and that reflects onto wellbeing and hence onto performance at the workplace. While businesses may have first been quite happy with the cost reduction associated with transferring all work communication to Zoom, many of those who use it regularly are already complaining of what some label as "Zoom fatigue". Just as lockdown fatigue. Many report frequently feeling disengaged during Zoom meetings - and surely failure of people to do their best, alongside with overall dissatisfaction with "the new normal", will eventually cost a business more than some travel and live interaction. Of course, there are and will be those who love it that way. Horses for courses. But it would be a gross oversimplification to say that everybody, everywhere will bin live meetings once and forever. Right now, circumstances force people to do it. But when the situation is no longer that pressing, I'm sure that many will gradually return to what used to be normal in the beginning of 2020.
Same for leisure travel. Most people simply don't want to live a miserable life of being confined in four walls and only seeing the outside world and other people through a computer screen. The whole misery of "work from home, shop from home, stay at home as much as possible in your free time and also spend your vacations at home" is only tolerable for a very short time for most people in their right mind.
So, the matter is not of whether mass air travel will exist in the future. The matter is more of ensuring the short-to-medium-term survival of the organisations behind it as having trading, viable businesses instead of just loads of planes, airports and people unorganised in any way will speed up recovery a lot. Not that it would be impossible to invest some cash into making a brand new AOC, get some planes on it and hire people to manage and fly them. But it would be longer and harder to achieve than restarting an already existing airline. Hence the need to do whatever it takes to preserve the existing companies. This might take some unpopular measures now, but those will pay back in the coming years.