It is true that the current story lines involve the Slaters, mainly because the strands of the stories involving them encompass other characters. But, as is the way of soaps, while a main storyline is being acted, a subsequent storyline is being developed, and will slowly replace the current 'main' action. If you notice, there is a scenario involving Alfie Moon, and you can be sure that his line will gradually eclipse the Slaters, as will Phil Mitchell's developing love life. This is the way soaps always work, so if you don't like The Slaters, hang on in there - it won't last for ever.