It isn't that simple. If Disney were to offer Express pass like at Universal the price would have to be exorbitant (VIP tour level) both because of the existence of VIP tours and the high demand for VIP tours. If Disney offered Express Pass at Universal prices, it would be a feeding frenzy and vacations would be "ruined" either by too many people buying Express Pass or Express Pass being 'sold out' so only those who 'win' the frenzy are set and the rest are fuming. Put it this way, would you go to WDW if they had Express Pass that sold out every day and you only had a 25% chance of getting one? That's functionally equivalent to simply jacking up the price and limiting tickets (see After Hours).If Genie+ had simply copied Universal's (limited) Express pass, it would have been a brilliant move. Professionals would gladly pay for it or fork over the cash for Deluxe rooms to have it included.
Disney is too popular to support Express Pass. I'm kind of waiting for Universal to become popular enough that Express Pass implodes over there too.