Speed Queen would get some of their loyal customers into buying their DW if they offered one, but its a gamble. It would have to be a really good dishwasher without any initial flaws. Not likely when building something from scratch.
Speed Queens safest bet is having their name on another design already in production. Next best bet is buying or leasing a design from Whirlpool or Miele and producing it on their own. Unless the volume of demand is excellent for years to come; all the tooling, training, building and warehousing would be a loss for Speed Queen. Banks and are not likely to fund such an endeavor IMHO, and Speed Queen is much to small a company to absorb a division failure.
What would really have to change is mass perception. People are going to have to truly want something different than what is already out there. If everyone were like me it would be a no brainier. Speed Queen would mold a standard tub quietly behind the scenes, stick a 1 HP motor in it, add a self cleaning filter, maceration, 3 wash arms and an EM timer. Once released it would sell into the millions- off setting any start up investment. Whirlpool and others would be forced to replicate the same design if they wanted anymore DW businesses. Everyone would be happy.
Unfortunately society is not there yet. We are, but you and me are only a small enlightened minority.