Even Bitcoin doesn't pump all the time. When this pump is over it will deep. It will be worth more than 5000 USD in the future, that's true. But why buy it at 5000USD, when you can get it cheaper after this pump finishes.
There is another question here, what if when this pump finishes price of Bitcoin stays more than 5000$? I have seen cases like that few times not. I think that it is always good time for buying Bitcoin, because no matter how much you pay, price will still be going up and up. I follow Bitcoin for few years now, and few times i thought it would be wise to wait and buy at lower price. Most of the time i was wrong, because price keeped on rising, and I always thought that i should have bought when i had the chance. Therefor, buy if you want and have founds to buy.