I think it is no because bitcoin is the base of all crypto currency it is the father of all crypto so they cant replaced it in no.1 but it has also possiblities that they can replace it i think ethereum is the next bitcoin that will grow or be competence of bitcoin but somehow still if other currency is increasing well bitcoin also will increase.

This makes perfect sense and only XRP can replace it. Because XRP is one of the coins manipulated by banksters (not a mining coin).

Yes it will. Very soon I predict.
Bitcoin will come crashing in the coming months in 2018. Its dropped ever since 20k and doesnt have the momentum to go up again.

Bitcoin is a shitcoin. A glorified shitcoin.
Yes it was the original cryptocoin and have made the way for the cryptospace to grow and thrive.
But today its a dead shitcoin.
It consumes so much electricity just to have the network running. It painfully slow. The network steals your money everytime some does a transaction because the fees are so high. It have forked to several subcoins because people cant agree and is soon forking more.
Bitcoin is mined today by the wealthiest miners that can afford expensive farms or hardware that overcome the laughable high resistance on the network, the rest are nothing more than investors. Investing on a shitcoin.

Time to move on. People are dumping their Bitcoins for something else today like XRP and Ripple, and I suggest you people do the same because odds are high that Bitcoin will drop bigtime in 2018. Unless you want to go down with it.

Let's say that PPC has equal security, etc, to bitcoin, that both of them have the same transaction fees, and PPC uses dramatically lower energy consumption. What would cause a shift to PPC? It seems to me that there is no economic incentive for anyone to switch from bitcoin, now and in the near future.