If you suspend SDCs, where does the revenue come from to upgrade the system capacity of sewers, the electrical grid, etc., to service all these new houses?  You have to answer that, or your proposal really isn't serious.

That being said, I don't disagree that SDCs can deter certain types of lower-cost development that might otherwise occur, but the money to build/upgrade/maintain the applicable systems has to come from somewhere.  

Maybe waive the SDCs for projects under a certain size (i.e., small ADUs where the hook-ups won't add much more than an additional bathroom in the house would have) and/or projects that include a certain percentage of affordable units to incentivize developers to build more of those.