Don't listen to anyone, if you happen to like current bitcoin price, then go ahead, just sell it and buy something nice, enjoy your like, don't wait and waste time forever.
I seriously doubt that people will firmly hold each and every satoshi till the price reaches a certain level. In order to benefit from whatever increase, it's always a healthy option to cash out some of your profits. If the price after that starts tanking, you can buy back at lowers levels, and ultimately increase your coin count steadily. If the price happens to go up further, you have enough coins sitting in your wallets that you can sell at a later point. In all the years that I have been in Bitcoin, one thing became very clear - the price
always falls back to x levels before going up to higher levels. In other words, if you play it right, you can increase the number of coins that you have throughout the years, and at the same time enjoy the increasing price. At the end of the day, it just depends on the people. If one likes to hold till $10K and further, then so be it. If one likes to cash it all out at $10K, then that's fine too.