Broadview could, probably, be extended further east into the parking lot?
It could. Though, there are all sorts of complexities:
1) Broadview doesn't necessarily need a lot more bus bays, but more room in each one, (so a wider platform more than a longer one).
2) The Streetcars, probably would benefit from platforms that held an additional vehicle (longer platform); though truthfully there are probably better ways to manage layover time and crews before that option becomes the most useful.
3) Widening the platforms would likely require at least some property taking of the rear of properties fronting Danforth; but also, likely the relocation of a TTC electrical substation.
Outlined in white below: