Holy shit, you need to learn to make your money work for you. If you're homeless in 3 months on a 200k salary, you're doing something very wrong.
That's not a fault of the UK salaries, it's you being terrible with your money. The US won't save you from yourself.
London is insanely expensive and you need a household income of ~140-150K£ to live like a normal person in continental Europe (80sqm flat with 2.6mt ceilings and insulated windows and working kitchen, I'm not asking for a toilet with a window because that would be super-upper class). If you don't go on holidays and are parsimonious with take-aways, the additional 50K to get to 200K are taxed at ~50%, so you get to keep 25K. If you lose your job, one year of savings earns you 3-4 months of survival.
I’d gladly move to the US if I didn’t have to go through their hellish immigration system (and I may leave the UK if the Brexit madness keeps degenerating).