Well I think a taxi would be very expensive from there. A taxi from the Orange County (John Wayne) airport is $40-$45 one way plus tip.......so a taxi from LAX would be at least double that one way.
Actually, if you're splitting a cab between people, it wouldn't be such a bad option.
You could check out Super Shuttle prices, or the
Disneyland Resort Express, but after adding up the cost for each individual person, it may make more sense to just rent a car.