The current recommended solution, 45 metre trains, would need a train every 2.5 minutes to handle that level of passenger demand. Which is right at the upper level of potential frequency for the corridor, if not higher.
We do not know if that 7,400 demand forecast is per hour, or per the whole morning rush period (~ 3 hours). The report isn't clear on that.
The required train type / size / frequency needed for 7,400 per hour is quite different from what's needed for 2,500 per hour. For 7,400, a street-median LRT would be near the capacity limit, and something more advanced should at least be considered. On the other hand, 2,500 is an easy job for the street-median LRT.