Federal investigations take a long time. Citizens get bored, skeptical of the need for them. Others follow and fascinated. Some sit back and keep a slow eye on them, loosely tracking.
But once they start, they usually continue until there’s a conclusion of some kind. Occasionally they quietly close.
Investigation into Election 2016 issues continue. FBI raids, Subpoenas issued. Hearings scheduled. Regardless of the “topic of the week” or year, they continue.