I wouldn't say it's impossibe but it will not happen for a long time.
Altcoins are growing stronger and stronger than before, however, only really powerful altocoins are able to compete with bitcoin, as most altcoins are copied from bitcoin, but are used with a different name. . Only a few altcoins are fully developed. And those altcoins are really powerful, they have absolutely a chance to compete fairly with bitcoin. But bitcoin is really too powerful, it has taken over all other altcoins from the moment it is formed.
define strong.
what you see is some trouble in bitcoin world that caused a lot of FUD and then as we all saw price was manipulated down to $880-$900 for a short term and panic spread throughout the market.
now altcoins used this situation and started their propaganda against bitcoin while pumping their price. but as we can see now, bitcoin is back to $1200+ and all those altcoins are declining day by day.