A bus every 7.5 minutes gives an average waiting time of like 3.75 minutes. Without actually looking at existing and projected ridership I think these frequencies are actually quite good....even on some of Toronto's routes it's like 10 minute frequencies, but you're right there may be some capacity constraints. Assuming articulated buses are used with a pax of 150 that's like 1,200 pphpd or a capacity of 7,200 both directions during a combined 3 peak hours. Considering the amount of people that are enrolled at Western and other employment centres that the line would touch, this may not have enough capacity to serve them with these frequencies.