It's too bad there isn't a ticket gate at the tomorrowland station before the exit ramp, preventing park entrance, thus allowing non ticket holders to ride. The monorail gets pretty busy at times though with just ticketed guests....
Oh my Gosh, what a back up that would create. First off, you would need 2 separate ticket turnstiles groups. One near the bottom of the Ramp and the current alternative viewing experience for ADA folks. Also need to take into consideration that the exit ramp is used by Finding Nemo and multiple exit points for the attraction occur after reaching the bottom of the ramp, and where would you place a set of 4 ticket turnstiles? And EVERY guest exiting at Tomorrowland Station would have to go through them every time the use the Monorail. Plus a second set of turnstiles next to the ADA elevator at the opposite end of the station's platform (west end). What a logisitcal mess.
Then the current rules for the DtD Station has it limited to Disney Hotel Guests use in the first few hours of the Operating day, and sometimes longer.
And you would have to have a Ticket Booth set up near the DtD to sell the ride only tickets, and then everyone entering the DtD station would have to show their regular park admission media, or the special "ride only" ticket. (Requiring the need to show your ticket twice in a short time if deboarding at Tomorrowland if boarding at DtD). And how much would you charge for a ticket that gives you about a 15 minute ride (actual movement)? And how many of these special tickets would be bought by guests each day? If you charge the amount you would have to cover the expensive costs listed above, the ticket would be more than a one day Single Park ticket (around $100, depending on the day and if bought in advance)/ Even if you did it as a loss leader, say at $49 per person, who would pay it, and if the singe day park ticket is about $50 more, clearly not worth it.
Disney made a tough decision, but a correct one, the amount of guests per day and traffic flows in general have changed since the 1980, and just doesn't make sense. (The Special offer was offered when the A through E Coupon program was still running (so plenty of CM's checking tickets back then), plus you didn't have the ADA rules, and also safety rules in regards to climate issues, since the old program was limited to the front and back cabs, which doors could be locked before leaving the Hotel Station and not re-opened until it made a round trip. So we have a limited amount of seats, and the Monorail capacity per hour has gone down a lot since the 1980's, where they had an extra train available for service (4 vs 3), didn't have to worry about stroller and wheelchair loading, whcih impacts the amount of time it takes a train to load.
So it became totally out of the question when DtD was built.
Similar issue with the old 1 or 2 hour Shopping pass that used to be offered. The program basically was leave a deposit (cash or credit card) the same price as an adult single day/single park ticket. And if you return within the time frame,and showed your receipt, they refunded the deposit. But when the World of Disney opened at DtD, you now had a location to buy Disney Park merchandise without the need of an admission ticket. And if it wasn't offered in the store (and over 95% of the merchandise in both parks can be found there, they can arrange to have it transferred to the store for later pick-up. So since some folks were abusing the program and not shopping, or buying the cheapest item they could and just enjoy a show or one ride, and it did cost to run the program for very little gain, once there was another good option (World of Disney), easy decision to stop offering them.
Alas, things change, and as with life, there are winners and losers.
