I do agree that airports need to be more integrated with other forms of public transport,, that they need to be more transport hubs, and that we need to enable integrated booking, etc.
But I also wonder what the future of short-mid distance air travel is. If we are close to a major change in the way that we power flight to battery, hydrogen, or something else, then maybe encouraging investment in that is as effective and useful as investing in more on the ground transport infrastructure?