They're not even the same game, sure, they both may have a payload mode, and some of the characters may play similar to TF2 classes, but Overwatch is not "TF2 2.0", the game plays very differently, with one character being strong towards another character while being weak to yet another character, etc., it's a first-person MOBA of sorts.
TF2 is almost a decade old and there have been many games that people thought would 'kill' TF2 yet most 'TF2 killers' died themselves and TF2 is still going strong.
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