I agree with you on Google+ being the path forward, but I cannot agree with you on supporting Google+ instead of (or along with) Picasa.
The APIs for Google+ and Picasa are very different. The former is more flexible and better documented, but it doesn't have support for things for which APIs already exist ... and one of such things is the photos' module, a.k.a. Picasa. The only things that the Google+ API supports are users and user activities such as sharing or commenting (that doesn't include photos).
And since Google+ is the path forward, they have been treating Picasa as the undesirable stepchild, hence it hasn't seen any useful upgrades. This attitude is apparently a very common malaise amongst Google-folk, as per quite a few of my friends who work there.
The net result of this rock-and-a-hard-place situation is that given a Google+ album ID, there is absolutely no API for me to figure out what the Picasa album name should be. And I can't dump the existing Picasa API because there isn't anything from Google+ that replaces it.
So for now I am stuck telling people to get the ID from Picasa rather than using the Google+ album ID.