Final nail in the coffin.
When ODI was introduced there was a saying something to this line;
"All good test players can adapt One day games, Not all good one day players can adapt test games."
(You can knock Gavaskar, the One-day player as much as you want to but he did score a century before he retired - there were no minnows at that time)
Patience is some thing that can not be learnt in few days. In test, patience is tested as a bowler and as a batsman. In one day, that patience has been curtailed to some extent. In T20 that patience is not needed. Matter of fact, that patience will ruin the win column (ask Australia vs Zim).
T20 tournaments are fine for other established nations. Very harmful for BD cricket and its young players who as of now don't know how to play "test". Our existence in cricket world depends on how we do in Test cricket not in T20.
"A good Test player can adapt the T20 format eventually but successful T20 players who struggles at the longer version can not adapt Test matches."