The gate with card access is a good idea as long as it is accessible to anyone with a current resort ID and/or Annual Pass.
These groups of people are the least likely to park at DTD just to skip the parking charge, since they have free parking anyway at the theme park lots. That means they would have a legitimate reason for being at SSR (the spa, shopping, enjoying the grounds, etc). Other WDW resort guests can take their hotel bus directly to DTD and the Annual Pass holders get special treatment anyway
This would also allow those visiting DTD to shop and enjoy the day with the mouse and have a place to park.
My thoughts on those who purchase MYW tickets (so you know my standing on this): Yes, they have the right to use Disney transportation. I do feel those who are not staying on property (or obviously are not investing in an AP) do not deserve to use the transportation system until they are actually ON Disney property (ie parked in a theme park or resort parking lot). The spirit of the MYW access to Disney transportation is so that Park Hoppers may easily and safely move from one them park, restaurant, or event to another and this is after they have paid for access to the WDW grounds (as WDW resort guests and AP holders have already done). There is a reason Disney does not have regular bus service to the DTD hotels, DTD proper nor any other resort outside of the WDW area. If non-Disney hotel/Resort offers shuttle service to the parks, then that should be used exclusively to gain access. If the hotel/resort does not, then pay to park. We all have a choice, and one of the main ammenities for paying a higher premium to stay on Disney property is the use of their transportation system. If a family is not staying on property, then they need to get onto property before their MYW ticket permits transportation, and I have an issue with DTD being used as that conduit.
Now, I have a follow-up question on the gate idea. Would restricted gate access be simply one way (DTD to SSR) or would a key card be required in both directions? Should our active DVC member cards permit access to the SSR grounds as well? What about the Swan and Dolphin room keys? I toured SSR, but I did not get to see the magical bridge

How would you think such an access point be restricted (how should a gate be built)?
Thank you for listening!