What knee jerk reactions? You asked if people were worried about GW, I told you I wasn't. I'm still not.
I'm not convinced that a veg box delivery is cheaper or the same price as a frozen Iceland delivery though. They do 900g bags of broccoli, carrots, spinach, sprouts, peas etc for 99p each. That's a lot of meals worth for low cost. My neice only ever shopped at Iceland for that very reason, she never found anywhere cheaper and believe me, she would have tried.
Changing banks, probably doesn't cost, no, but different banks have different perks - for e.g. car breakdown cover or insurances. If you lose those perks you may need to pay for them elsewhere.
Changing energy suppliers - Well it may not cost to move, but we go with the cheapest every single year, currently with Ovo but if BG is cheaper next year we will swap. Our usage is extremely un-green (Aga) so we have no choice but to go with the cheapest supplier. We looked into Aga removal but that was going to cost us £4K. We are financially sound but can't pop that sort of cash out of our back pockets.
People with electric or gas meters often can't change or are charged over the odds for meter removal.
Look, I'm not purposely having a go, but you need to look further than your own circumstances to see that other people have different views/problems/issues that mean your way of living will not be possible. When you then patronise people or do the 'I feel sorry for your children' schtick saying that their kids are going to suffer because of the choices they have made - when often their choices aren't 'chosen' at all, all you do is alienate people (and I'm not saying that for my benefit, because it really isn't something I'm worrying about, but for others who might be reading this and feeling like dog shit right now)
You probably would have been better off with a thread that gave people ideas of little changes they could make, or big changes if they were able. Not this one.