Few flaws with your suggestion.

1. "You can only get x gil every day through trades" won't stop RMTers, bots or people who already have Millions+. Most RMT (That I've noticed) goes through the Market Board or deliveries into Company Chests. That doesn't count as "trading".

2. By removing the RNG timer, it is actively removing any chance that normal players could get the plot, let alone even SEE them open. With the Bidding system, people can easily stack the bid so high that only RMTers / Bots / Omni-crafters to have a shot, while leaving all the others in the dirt because they don't have enough gil to play. I believe that'd be more annoying than losing the house.

At least with the RNG timer, people have a chance. It's far from perfect, but it at least minimizes RMT / Bot purchases by limiting their capabilities to that of everyone elses, instead of simply being able to outright buy the plot the SECOND it becomes available.

Ontop of that, there are communities out there (especially on the NA datacenter!) that are reaching out to players trying to get housing to help them by reducing their camp-time or a channel-wide Ping when plots in <insert ward here> go vacant. You just have to poke your head out and look about.

And before people cherry-pick this post (Because it seems like a real big issue on this forum), please read it in its entirety this time.