Will fast food brands like McDonalds and Burger King/KFC decline/disappear in another 10-20 years?

I feel like brands and trends come and go, and just like the old fashioned diner or some other American retail brands that basically disappeared off the face of the earth, aren't McDonalds or KFC or Burger King, just like even established iconic car brands like Toyota or Ford, won't these eventually disappear, I mean just from consumer attitudes or "things come and things go" in another decade or two decades? I feel like even at age 30, 'the taste of Big Mac's, I barely feel like eating half of nowadays' after eating them so often especially from ages 18 to 25 with such a good metabolism.
The metabolism has slowly been fading of mine since my late 20s started around age 27 and in now 30. I weigh 4 kilograms heavier now than I did 3 years ago. Lol. Not that it 'shows' gratefully much. Yet it's on the decline lol, just like I wonder about brands or society. Is 30s year old me a symbol of the present and the future? Lol πŸ˜‹ ♂️
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Let's agree to disagree my man ♂️ and we can both be right hahahaha
Will fast food brands like McDonalds and Burger King/KFC decline/disappear in another 10-20 years?
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