Actually, according to my personal opinion, Bangladesh is in bad form in almost all formats, but compared to all of them, I think the Bangladesh team is in a slightly worse situation in the T20 format, so without this kind of performance, good performance cannot be expected from the Bangladesh team at the moment.
I think Bangladesh will lose the next two matches and Sri Lanka will be able to successfully whitewash Bangladesh. Because everything is in Sri Lanka's favor, from the field to the form of the players.
Almost every fan is not very hopeful about Bangladesh cricket team right now especially in T20 games. And see them in bad phase and do not expect them to play well.
And yes Sri Lanka will win all upcoming matches against them which makes sense because Sri Lanka looks to be playing well and has home advantage. Let's see if Bangladesh can prove everyone wrong but right now it looks tough for them.