Would we necessarily get gravitons on quantizing gravity ?

Whenever we have a classical theory with wavelike solutions, its  quantization generally gives the corresponding quantum particles. For  example, Maxwell’s theory of electromagnetism predicts the existence of  electromagnetic waves. So, when this classical theory is quantized we  get photons, the quanta of light. 

Similarly, Einstein’s  theory of gravity predicts the existence of gravitational waves.  Therefore, it is expected that a consistent quantization of gravity  would give gravitons, the quanta of gravity ( at least in the regime  where ‘nonperturbative’ effects are negligible ). 

However, if we  really ‘need’ to quantize gravity or not is a different question that  is still not understood very well. For example, there exist ideas like  “entropic gravity” in which the Einstein’s equations can be derived from  some thermodynamics considerations. If gravity is really some kind of  ‘entropic force’ then it would be conceptually wrong to try to quantise  it and hence there would be no gravitons.