The full series between Bangladesh and Sri Lanka is over but both Sri Lanka and Bangladesh will focus more on the T20 series. As this year's T20 World Cup will be held with almost double the number of teams, this World Cup will surely be the center of attraction.
I can agree with you on the ODI and T20 World Cups. Most of the teams focus on respective formats when these tournaments are near. But I don't agree on the World Test Championship. It is spread out across three years and none of the teams outside the pig-4 take it seriously. Test format is a costly affair for the full member nations. It doesn't bring any revenue, and it actually impacts the revenue earning capability by eating up the calendar and getting players injured with the heavy workload.