I wouldn't buy altcoins right now, because I want to gain the new "Bitcoins" on hardfork in October and November. But if you don't care, it would be the right time to buy alts. They will for sure go up, after the Bitcoin "show".
I agree with both of these statements but mainly this one. Bitcoin is on the rise because everyone is moving funds there for the fork. However I think any good ICOs coming out will have a lot of new Life coming their way after the Fork.