There is no restriction preventing a future subclass 189 application although the planning levels (quotas) are significantly lower than previous years. You should check the EOI data to see how many EOIs have been submitted for your occupation at your points level (and higher) and how many invited/lodged applications have been made. Do also note that an expired RRV doesn't prevent you applying for an RRV in the future. The general guidance is to ensure there is no more than 5 years between trips to Australia (even as a visitor) as this will allow to apply in the future without compelling reasons for absence. When you apply in the future you will need to travel to Australia (on a visitor visa is acceptable) and lodge the application while in Australia and you will need to demonstrate substantial ties of benefit to Australia. There is also specific policy under the RRV to consider applicants under 189 and similar skilled-based visas, where they have opportunities to remain overseas to develop their career, and this can be considered as it will have the potential to contribute Australia in the future when they bring their developed skills to Australia. I have successfully assisted applications who have held a permanent visa more than 20 years ago, and recently established ties with Australia that allowed them to obtain a new RRV. These have included completing a year of study in Australia on a student visa, being involved in cultural events in Australia and short term employment in Australia. Do speak with a registered migration agent for advice in these matters. as there may be opportunities here you're overlooking.
