Think these services will most likely be affected after CCL 1 and 2
opens. I would think that service 24 might get shortened to operate
from Eunos interchange in future.
For services 22 and 58 it might terminate at
Serangoon - just nice to reduce its fleets after the WA Merc
goes off 
For service 70's case can't wait to see the great impact after
CCL 1 and 2 opens
(as mentioned by me already in another
thread)
Point 1:
Sv. 24 is a Airport-plying service and I am doubtful that
LTA/SBST/PTC would want to reorganise 24.
Point 2:
Sv. 22 has demand from AMK to Tampines/Ubi/Serangoon. Won't be
changed much too.
Point 3:
Sv. 58 if amended to Serangoon Int would break the 5x series of
Bishan.
Point 4:
Even when CCL 1 and 2 opens, you must understand many people
would rather take the bus than the train, simply becoz along the
way, some people's houses are nearer to the bus stop than the train
station(which is usually the case along Guillemard, and also for
factory workers near Kim Chuan).
Point 5:
Didn't SBST already mention that they will not do any
rationalisation of bus services whatsoever???