Well it is expected..when taxi fares increase, the bus and MRT will follow suit. Its not new....just that everything is not spaced out evenly. Cab fares increase for one, two months then its the bus and MRT.....
as usual reasons like ...fuel prices increase, increase manpower costs, shorter lead time, better service provided so got to increase fares, then with the new CIRCLE LINE coming up, too so public transport is definitely NOT CHEAP NOWADAYS anymore in Singapore... but comparing them with other countries like Japan/US, we are still on the low side (that will be the providers arguments for raising fares.)