I know no one wants to hear this, but Airbus just has a better product (from a passenger standpoint) - the cabins are better, the planes are quieter, the ergonomics, lighting, HVAC and pressurization is better, etc.
I know you think this seems very logical, sane - but you have a tell "outside city limits" - you want these people rounded up and bused out. it's not a solution.
Sane policing, treatment programs, and massive development is the solution.
Luxury isn't necessarily about price (although it's a common component) - it's an ephemeral combination of prestige, exclusivity, quality, and wealth/taste projection.
The bigger problem here is that Allbirds ISNT a luxury brand.
They've drank the Silicon Valley cool-aid of growth above all else, the "reforge" growth-hack school of tips and tricks to optimize conversion rates and customer retention, without actually building a storied brand - which is what a real luxury brand is (see: LVMH's holdings, Hermes, or more recently Aesop).
There's no storied history, hell - their LOGO isn't on their products. They're PERFECTLY ripe for generic disruption.
If they had hired real brand marketers, not growth addicts over-analyzing CAC/LTV/AOV formulas all day, they'd have a more defensible position in the marketplace.
By the way, your analogy of sunglasses is flawed - those cheap sunglasses look, feel, and function cheaply.
Boeing is now Ford to Airbus's Audi.