I can predict that virtual classes will be more popular in future and technology will make it successful. There are already a couple of online platforms which offer Bangla courses where a student can have a face-to-face classes with teachers.
Buddy School offers Bangla courses. There are 10 Bengali teachers who teach online.
Verbalplanet also offers Bangla courses. There are 4 teachers now. I joined Verbalplanet last year. But I did not continue there. That
nativemonks has 3 Bangla teachers.
Italki has two professional Bengali teachers and two community teachers. I have been teaching in Italki since August, 2016. The platform suits me. I have been getting a lot of students.
There are other language teaching platforms but they don't show teachers' profiles. I do not appreciate that.