SMRT clearing out those old buses + O405, should be ok for
now.
How certain are you that SMRTB would scrap the O405s without
extending the lifespan? And considering if SMRTB wants to scrap the
ELBOs, there would only be 15 slots cleared (ELBOs + UDs). WLDEP
has 328 parking lots, minus off the UDs and ELBOs there would be
352 buses. Still overshot by 24.
AMDEP has 175 parking slots and Yishun Int has 77 parking slots
for overnight parking. It has 267 buses. Minus the UDs for revenue
service there would be 265 buses. Overshot by 13 buses
KJDEP has 199 parking slots and BB Int has 55 parking slots.
They have 316 buses. No revenue UDs so overshot by 62 buses.
Add together and you get 99 buses which have difficulty in
parking at depots or interchanges overnight. Alternatively they can
park overnight at WRI, but it may be good to have a new depot so
that they could buy more buses to perhaps improve the frequencies
or something ... ...