Other Alternative cryptocurrencies are being launched day in day out. Would these Altcoins be widely accepted as Bitcoins?
Why would any altcoins be considered bitcoins?
They will forever be branded as altcoins. Even the closest thing to dethroning bitcoin right now, ETH, is still extremely far away from ever claiming that #1, prestigious spot. I think the main thing is that people have trust in bitcoin and see that it is the most well known and most well established cryptocurrency, and they are unlikely to invest in anything but bitcoin for the long run.
Alts can obviously fill the gap for particular niches that need decentralization, but BTC should still be #1.