Are you certain you are not just being biased? I'm not convinced you aren't, and here is why.
You say all sorts of things are possible.
You believe this happened. No problem.
From this...
to this...
You believe this. No problem.
Bugs across globe are evolving to eat plastic, study finds
You use this as a "Hurray! Evolution!".
Scientists Have Discovered a Bacteria That's Evolved to Eat Plastic
Then you argue against lions evolving to eat vegetation... arguing that they would not be lions if that happened... or it just can't happen.
So, I propose that either you don't believe evolution takes place, or you are just biased... not to mention, the worst kind.
So which do you say it is?
Also, rather than they argue and say it can't happen, would it not be better to explain why it cannot happen?
Since you believe this is about lion anatomy... which evidently it isn't, perhaps you can start, by explaining to me, what's so different about the lion's anatomy, than the above, to prevent it changing.