I can 100% totally agree with you. Bitcoin is something that cannot just be outdated with regular cryptocurrency which would be developed after it. As far as we can see there is no competitor to bitcoin on current stage.
Bitcoins will never be outdated but it was possible if there will be a new coin in the future that is going to replace bitcoins since the competition in the market today is very tight.
especially if the new coin has a different specification from bitcoin and that new coin has another benefit comparing to bitcoin. but I don't think that bitcoin can be outdated from the other coins because in the cryptocurrency itself, all coin is followed bitcoin only and they cannot step forward from bitcoin except if the other coin gives something different than bitcoin.