What I would have liked to see them do was:

Make the main wards for FC's and the sub-wards for personal. In theory if they implemented this now, they could grandfather anyone with a personal on a primary ward into their existing plot. If they end up losing the property then it goes back up for sale for FC's only.

Additionally, I 100% agree with the 1 personal house/1FC house per account per server idea. While it wouldn't be enough for everyone it would have eased some of the strain between the times they add new wards/sub-wards. Again, in theory this would be easy enough to grandfather players into. If you have multiple houses on alts on the same account/server and you lose one (decay timer) you can't get another on that toon.