Board Thread:Spoilers!/@comment-1916997-20160411053450/@comment-24674051-20160411170250

First. Adam and Eddy could decide to end the series, but the chances of them making that decision unilaterally are about the same as snow happening in the fire pit in the underworld.

ABC can decide that, due to the ratings declining, they can end the series. They do that all the time. However, they would only do it to a long running show like Once when they have something in the works that could potentially replace it and bolster ratings. And even though Onces ratings do not look that great, they still have better ratings than most of the other Sunday Night network shows (discounting the specials), so there is no immediate fear that ABC will terminate the series, and they definitely will not do so at this point without a fair amount of warning.

All that being said, the article did not say anything conclusive about there being anything beyond season 6. I read it more as "Once is not as close-ended of a series as Lost, and therefore does not need to plan on an definite end date. It could continue for as long as it needs to."