Direct democracy: obstacle to reform?

Swiss direct democracy is often accused of being an obstacle to reforms, with the strong influence of interest groups being the reason. Actually, the referendum has a retarding effect: it implies a status quo bias. On the other hand, the initiative has an accelerating effect. The influence of interest groups is hardly larger in direct compared to representative democratic systems. Thus, it is highly questionable whether the abolition of Switzerland's direct democracy (at the federal level) would—in the long-run—really lead to political decisions which are more open to reform