While I think this is the right stance for the next election for this particular issue I do get disheartened with the lack of ambition being talked about by him. Reason being is I expect him to stick to what he campaigns on, unlike Boris or Rishi who I wouldn't trust to stick to a single pledge in their manifesto and actually deliver something very different (if at all) in reality.
We need radical improvements to education, health, law and order, housing, etc. We can't do that without increasing the money the government has, through some combination of raising taxes, improving the economy, or reducing spend. It's not going to be possible to do this without annoying a large cross section of Tory voters he is courting and needs to court. If he sticks to what he campaigns on, are we really going to have to wait for the GE after next?