My thought of 100 miles of trail is similar to a whistler-blackcomb situation. That ski area has so much trail that no matter what expertise you have, Beginner, Mod, Adv, it'd be very hard to do all the runs within one weekend even in your skillset.
Reiter will have ~9 miles of what I hear could be very difficult terrain. If its 9 miles of BYS or the Busy, thats awesome. But what about those on stock rigs? What about those on 33-35s?
This is why I'm aiming for that 100 number. probably 33 or so miles would be BYS/Outlet mall/BUSY difficulty. If we had 33 miles of that, it'd keep the expert rigs tied up all summer.
Add to that another 33 miles of mod-difficult trail (33-35, one locker), and you have 60 miles of decent trail for those with 35+ tires, lockers, etc.
Add another 33 miles of easy naches or current walker style easy trail (connectors, view trails).
Quality has many different terms. I do not think X miles of only hard trail is 'quality' in terms of an orv park. Quality has to encompas the whole spectrum of users. By giving each sub group enough trail, bypasses will stop happening because people would have options.
