2 is the backbone of EWL. 147 is the backbone of the EWL and so
is 133 somewhat.
80 actually duplicates MRT lines throughout the route, NEL from
Sengkang to Kovan, CCL from S'goon to Paya Lebar, EWL from Paya
Lebar to Outram Park, then NEL to HarbourFront.
Now i think that 24 28 70 should be left untouched, the others
amended or withdrawn. 24 can also be amended to ply S'goon
Ctrl.
80 I think should still be withdrawn, possibly 2 can ply Geylang
East Central and perhaps extended down to HarbourFront via 80's
route. Pax from SEK - HGN have alternative services 27 87 89 and
SEK - KOV 119.
22 should be withdrawn or amended to loop at MacPherson Estate or
terminate at Sims Place. 93 be withdrawn or cut to Bishan -
HarbourFront. 76 can be amended somehow, with 24 70 as backbones of
this part of CCL, this should be enough.