I completely agree with this, there definitely seems to be a lull before this World Cup which isn't usually the case.
I do think that this is largely political:
Firstly it's the first World Cup since the FIFA corruption case in 2015 - I think this really damaged the goodwill of FIFA in the eyes of the general public. If you couple that with the fact that Russia won this World Cup in debatably unscrupulous circumstances and the well documented issues Russia have had within football; hooliganism, racism, etc and the wider geopolitical view of Russia, and there is probably just a slight sour taste for some this time around.
Contrasting with the carnival atmosphere of Brazil 2014, a country that lives and breathes football like no other, and this was always going to seem like a drab affair, even without the above mentioned circumstances.
We are supposed to believe that World Cup/Olympic bids are either awarded as a vehicle for development (Mexico, Japan/Korea, China, South Africa), or perhaps sentimentally to a country with a rich history and tradition in football and/or the infrastructure to host such an event. The awarding of Russia with this World Cup doesn't seem to fit either criteria.
I also think that the reality, which will come clearer in the coming years that football is all about commerciality these days and frankly, the Premier League and Champions League in particular are much more marketable for sponsorship/TV rights etc, due to the fact is generates infinitely more coverage, with eh World Cup being only a month, once every 4 years. The majority may, in the next 20 or so years look at the World Cup as a b-side, which would be awful to see.
We will see if this all changes in the next couple of days and come the opening ceremony, but I certainly agree that World Cup fever hasn't struck, or struck as hard as in the past just yet.