Or cutting other things to pay for it, in addition to smaller tax increases. And the costs go down once it's bootstrapped long enough to obtain the long-term economic benefits that grow the economy (which will take a while to materialize).
Honestly, my biggest concern with it is that people will (rightfully) worry that it won't last more than 4-8 years because the subsequent administration will attack it with everything they have, and thus treat it as temporary.