I agree, but same market cap would mean price of BBR > XMR due to smaller daily emmision. Not gonna happen, as soon BBR will get close to the price of XMR they will start shorting like crazy.
Remember though, a lot of the them had indicated that they would exit CryptoNote altogether if BBR were to ever overtake XMR in terms of marketcap (since they considered BBR a "clone launched later"), so the path may be easier as the MCap goes higher (if they were being serious with the threats

)
For me it is quite important that the heaviest volume move to a new or different exchange. Poloniex interface is great but it just has other factors going against BBR being traded there in XMR territory.