If it were properly encrypted it might be negitible. But DNS for instance still isn't. And the BGP is completly broken. There was a case recently where someone

If it were properly encrypted it might be negitible. But DNS for instance still isn't. And the BGP is completly broken. There was a case recently where someone used BGP to redirect users of myetherwallet to steal their coins. They failed to obtain a SSL certificate so the users could have noticed. But with a more sufisticated attacker I think the average user has no chance to detect such an attack.