Is this a buying opportunity, or BTC has lost its "mojo"?

Are you talking about the Sec decision if yes it failed but since u can see,it didn't affect the price (at least for now) .No this is not a buying opportunity, a buying opportunity is when btc is at 200$ .

And no btc will never lost his "MOJO" as long as the darknetmarkets support it + a wide range of online retailers.