Even if it touches to $5k then majority of users will be satisfied to see that price and everyone will prefer to sell their coins when they see that price.
it's all relative. if/when bitcoin sees that price range, the sentiment and distribution of investors will have changed. at that point, it may seem that $5k is too low to sell. only time and market psychology can tell.
No, once you see price of bitcoin increase to $5000. It is surely mean that bitcoin is already widely accepted by merchants and people won't bother to convert their coin because they can directly use it online for buying or selling things.