For a plot "without flaws" in a location that suits me, the possibility of not using it myself anytime soon would not matter. If you don’t have very unusual demands regarding the floor plan and the design of the house, it will usually be easy to rent out – especially in this region.
If you are under no legal or financial obligation to build soon, you could leave it be. Or you could build your house soon and rent it out if the commute does not justify living there yourself for the time being.
With a granny flat, you would have both options: either rent out the granny flat and leave the owner-occupied part untouched as long as you don’t use it yourself. Then you have a house that is not unoccupied and a small income. Or rent out the larger residential unit, comfortably cover the payments from that, and treat yourself to a weekend home.
Plots above a minimum size (or without vineyard slopes or similar nonsense) will remain scarce for quite a while – what is not bad is systematically snapped up by the market.
On the other hand, resale could still take a while: most home builders currently fall into the category of "financing with little wiggle room" and therefore specifically look for plots of minimum size – that is why so many of these are offered. In my eyes, much of what is today disparagingly called "building areas" should rather be described as "cage keeping of mortgage debtors."