Everything has tradeoffs. I expect bitcoin to become the global reserve currency with everything else trending to zero against it. It is the most censorship resistant and robust network at the protocol level and it is hard to see any other chain overcoming that lead. As a result it seems more productive to me to try to make it easier to use bitcoin privately because it will win whether we make that a reality or not. That said, in the short term it seems completely reasonable to use monero as an additional tool when it comes to transactional privacy with the overwhelming majority of savings held in bitcoin.