"Hangouts (replaces Talk)" -- can I replace Hangouts with Talks if I don't like it?

I'm disappointed that Google Hangouts is going away from XMPP. If I download the "Hangouts (replaces Talk)" app on my Galaxy Nexus (Google Nexus 3), will I be able to go back to Google Talk, if needed? Is there a way to keep Google Talk? Or is there a way to communicate with people who use Google Hangouts through Google Talk or XMPP?