There would be many similar opportunities in future as well, alt coins are being launched frequently. However, you need to research properly to find some hidden gems.
That's right, there's new ICO appearing and that also means that there's new opportunity of getting into the profit train but however I guess that it's kinda harder for a newer coin to go to the moon because all the technology sectors have been fulfilled with the oldest ICO, that's my opinion but lets be realistic here, many ICO are just trying to repeat what older ICO have done.