About an "Econo" line: if everyone who can't afford to buy a new upper end Mastercraft only has a choice of a used MC or a new Axis, Moomba, etc.. How is this so much better for MC and the dealers? If people sell their boats privately, MC doesn't make any money and if people buy another brand its even worse. Plus there are always going to be the buyers who will only buy brand new.
I don't think there is anything wrong with an entry level MC line if it's done right. Therin lies the hard part, doing a value line right. Their attempt with the X1 failed because, as others have mentioned, the boat was just too small to compete. The current X-2 or X-15 hull might make a great budget boat on the other hand. 5.7 motor, basic electronics, bags instead of tanks (so they can be easily upgraded).
2013 X-30, 6.0L with 2500lbs of ballast and 500 lbs of lead.