This was always going to be the case with a complete new build. If we're living in the financial world of quick "returns on investment," all new seats have to pay for themselves asap. For a whole new stadium, every seat is new, and there can be no cross-subsidy from ticket sales in old stands that were paid for years ago. Of course construction costs can usually be offset by sale of the old stadium, but that hasn't been the case for us (Yet). So without the philanthropy of a rich owner and/or massive sponsorship, a price hike was always going to happen.
That said, if (as it seems to be the case) Moshiri is taking the bulk of the stadium debt with him.... and the new owners are essentially getting the stadium for a snip, then provided that the debt of the sale is not fully loaded onto the club and projected increased income from the larger corporate offer is achieved, hopefully those high price increases for general admission will not be needed. We can only live in hope.