Doubt it for the older units... Look at how many spare VOs there
are now. I believe there would be enough Wrights to replace the
Batch 2s when Jan 2016 comes and the first units deregister. May be
different case for later units (955x to 959x series) though...
In the first place, the Batch 2 Olympians were
extended to two years because ppl thought there are not enough
buses, unless it is 9597-9600 (4 buses), where it was not extended
because there are enough buses to cover them.
There will be enough Wrights to replace Batch 2s soon. Maybe
different case for Batch 3s, as Batch 3 do not raise the
issues.