If we believe in this technology (and more people start to believe) then the cryptoworld gets more traction and attention - driving the prices up. It is not a question whether to invest. The question is which altcoins to choose as an addition to Bitcoin.
Bitcoin seems to become the new gold for the new century. So it is evident to invest in Bitcoin.
Litecoin is becoming a reserve currency. At this very moment it can clearly be seen. So, I'm going for Litecoin for this July and carefully buying into Bitcoin.
After Segwit? We will see.