Good question!  It's challenging to draw too many inferences about multi-decadal hurricane variability from a small sample size, but there is at least one study that suggests that Atlantic major hurricanes declined from 2005-2015 because of slow variations in ocean processes, namely a slowing of the Atlantic Meridional Overturning Circulation (AMOC).  (I hate to add another acronym, given my acronym-filled response above, but the AMOC and AMO are believed to be related).  You can find that study here: https://www.nature.com/articles/s41467-017-01377-8.  So that study seems to be in agreement with your idea of an end to the active Atlantic hurricane cycle resulting from changes in the Atlantic ocean circulation.  However, I hesitate to conclude that such an inactive period will continue.  After all, the 2017 Atlantic hurricane season was very active.