Still, people wanting to use it will likely switch to chrome. That's a tactic google already used for hangouts - only to end up with a very unconvincing "oops,

Still, people wanting to use it will likely switch to chrome. That's a tactic google already used for hangouts - only to end up with a very unconvincing "oops, that was a mistake" answer (see https://twitter.com/johnath/status/486575645338918912 https://twitter.com/johnath/status/486575645338918912). Instead, you could just notify the user that performance may not be as good on other browsers for now.