I harbour a secret desire that one day a pope will suggest we begin systematically moving closer to "our separated brethren" in practice by listing all of our peripheral, unessential practices, that those brethren find offensive, or inexplicable, or in someway off colour. As a sign of respect for them, we Catholics would begin a quiet program of gradually dropping those practices, not by decree, but (1) by education and (2) by attrition. 

The education would point out the history and rationale for the emergence of those practices (generally late, and for theologically unsound reasons), and elucidate why our brethren find these practices suspect (generally, a better theology).  

And the attrition would work by training priests to avoid these practice without explicitly denying them UNTIL they had become quaint remnants of our past. 

High on my list of such practices would be: mass stipends, indulgences, and benediction.