I don't think anything will happen. Bitcoin has always been and will remain the first number. In order for the capitalization of any cryptocurrency to increase, huge money and coordinated actions are needed in the market of those who invest this money. But the most difficult thing is to keep the capital. It's difficult.
Yes for sure, it will remain as the first on the list, but I dont know if thats forever, its also possible that another cryptocurrency can take its place if it no longer offers what investors are expecting from it, just like many were complaining last year that the fees for transaction was too much and they did correct it this year, and we can all see that the fees is now very low.
Its no longer fast as it used to be at first and we are still yet to see the lightening network that they promised us, but if that will introduce more fees to makes things costly, then I will recommend they ignore that project and focus on something more better.