When it comes to insulin delivery methods, I'm willing to contemplate any method. The variables to weigh, for me, are performance of the insulin versus PITA to use. For the pump versus MDI, both variables are completely circumstancial but the pump wins out overall for me bcause the insulin just works better, unit for unit, when delivered via pump.
This "injection free" method would have to do better than a pump in some way, shape, or form. If not, the novelty wouldn't be enough.