Show me an article where it said they were getting rid of picnik? So far I just see a bunch of people whining about something that they might be confused about. If a company buys another company it does not mean they are getting rid of it because that would be completely pointless in buying it the first place.
http://www.picnik.com/ No, Picnik is not going to be completely gone, but when it moves over to Google, you have to sign up for G+ in order to use it.