I dont think investing in bitcoin today is late cause the decentralized platt form is still new and so are others under it new and it has got a future ahed.bitcoin has not even reached its goal rather just starting.so no time is late to invest
I think yes it is already late but it does not mean that we should not invest money in bitcoin now, still bitcoin is providing opportunities to people to invest their money there, and get the benefit from its price, i think that after few months we may not be in position to trade bitcoin in current time again.