Hi Bob, can I ask why you want a replacement?? Picasa continues to work fine. And, I recently downloaded it to a new laptop. While, true, they are no longer updating it, it continues to work just fine for what you have previously been using it for.
I'm w/you. Why do you want to replace it? I use it in conjunction w/other programs. Have always used it to insert my name & copyright on my photos. Also, I like the "filtered B&W" feature for nice tonality. Have just recently installed the Nik collection so w/have to see how that compares. IMO, keep it!