You are talking about 10k$ as about some limit for bitcoin, but it stayed only around 800$ to reach it and to bitcoin with it's temps of growth in the current time this target can be done within a day (!) What will happen after that?! Nothing, bitcoin will continue it's road, nothing will generally change, maybe it will appear some new milliarders who become rich with bitcoin or maybe some new countries will start bitcoin's legalization or Jamie Diamon will start to like bitcoin
And some of other crypto will definitely rise in their price, cause of new people will see all advantages of cryptos and will invest rather into popular alts, such as Litecoin, Bitcoin Cash and Etherum while they do not cost too much.