People are also tending to glorify the old league system as well. If you want a 'dud' end to the season, just have a look back at the 'good' old days of top equals champions. More often than not the competition was over well before the end of the regular rounds, and avoiding relegation was the only thing keeping some clubs going.
What saved the season from being a complete fizzer at the end was the Challenge Cup Final (again usually a month or so before the end of the season) and then the hopelessly contrived 'Premiership', which was a knockout trophy for the top 8, and certainly in my lifetime was won either by the team that really wanted it, or in later years Wigan if they could be bothered.
Now, we have TWO massive finals each season (as opposed to county cups, john player and all the other second-rate cup comps we used to have). Both are big events, and generate a lot of interest for the sport. I can just see the massive news interest in Team X managing to win the title because Team Y lost against Team Z three games before the end of the season - NOT (which again believe it or not was the sort of way the league title was settled in some seasons).
The Grand Final is a huge plus for the sport. The Play Off format could be improved on, but suggesting we get rid of it for the sake of some fictional purity is ridiculous.