I think it will never obsolete because there are many developers, users who are trying to fix issues, bugs, add more features to bitcoin system. Bitcoin has a huge community behind it.
Yeah,you're right, bitcoin will become obsolete if there isn't any renewal of bitcoin, but we know that developers will always make improvements to bitcoin so that it can continue in accordance with the times. what I'm afraid of is not that, but when it comes to one coin with better innovation then it makes bitcoin look bad and obsolete