This is a very brief description of what happened at last October's ITU meeting in Geneva.
A resolution was proposed to redefine UTC by replacing leap seconds by leap hours, effective at a specific date which I believe was something like 2020. This proposal was not passed, but remains under active consideration. Presumably something like it will be considered next year. My quick computation indicates that, should this proposal be adopted, it would take about a century for UT1-UTC to diverge by one minute, and many centuries before a leap-hour would be called for. I did not attend the meeting, and this is all I know. I was told the ITU web pages had essentially this same information in them, but could not find anything there with their search engine.