Despite Ireland just falling short of reaching the Super 10s, McCallan says there is still plenty for them to be optimistic about.
With next year's World Cup in Australia approaching, McCallan says Irish cricket is continuing to strengthen and they will be better off for their campaign in Bangladesh.
"As with any tournament, there'll be a lot of reflection as to whether it's successful or not but I suppose fundamentally Ireland were unbeaten up until today," he said.
"They'd won eight games out of eight in the quest to get to the main stage. They'd won the qualifying tournament, they were in the box seat during the qualifying round, and it will be bitterly disappointing.
"Clearly what Ireland want are more games against full member countries on the big stage for that experience. Unfortunately this time it's not meant to be but I'm quite confident, with having already qualified for the 50-over World Cup in Australia and with the other things in the pipeline, Irish cricket is in a very healthy state.
"There's a lovely blend of youth experience in our side who will have gained massively from today's experience some way down the line."
