At this point, I'd definitely say diversify your cryptocurrency holdings and keep your fingers crossed. Bitcoin may stay on top, but that's not guaranteed and the current network congestion plus all this infighting over Bitcoin Core, SegWit and the latest thing that Roger Ver said is definitely not helping.
I really just don't think this is true in the least, I think that the reason for the issues here along with scaling issues is that theres a lot of money to be potentially lost by miners due to changing the scaling solution as it would block out some miners advantage in their ASIC's (looking at you here Jihan, you sly fuck)
This wouldn't be happening in an altcoin because altcoins don't have the same amount of people using them with day to day transcations like bitcoin does, so it's pretty unreal to think that an altcoin could ever take over Bitcoins place in the Crypto world.
TRUST BITCOIN, NO ALTCOIN CAN DO WHAT IT EVER DID