DCC have offered no viable alternative route for the huge volume of busses reliant on College Green. That's why ABP refused them. Some of these busses (13, 40, 27) incidentally serving areas without alternative public transport options like North and West Clondalkin, Tallaght etc. The only plan seems to be to ignore the thousands who will be negatively impacted, and funnel the routes down the narrow, traffic choked quays, along with all the other traffic that has been, and will be displaced by College Green ban.
Thankfully it was only an hour or two, but closing the main artery is not and has never been a good idea.