With the addition of new data centers, players have moved and open up many plots on many servers.

I took a look around Leviathan (my server) to ascertain the number of bids across all open personal plots. The short version is:

641 bids across 30 small plots.
146 bids on 1 medium plot.

There is about 22 hours to go on bidding, so these numbers can go up.

I interpret this data as such:

This is one of the best times to try and get any plot. If a player owns no house, they are likely bidding on a small, not the medium since the odds are higher (1 in 20 vs 1 in 146). The bids on the medium are likely players that already own a plot. Which means, there are about 641 players on Leviathan actively searching for housing.

Considering how little time investment is needed to put a bid in on a plot, the barrier for entry for the majority of the playerbase is simply logging in and having 3-4M gil to spend. Time is not really a factor.

This leads me to conclude that the demand on a populated server such as Leviathan is not as large as many are led to believe. The addition of 3 wards to all areas would add 900 plots.

The supply-demand gap might be much smaller than many believe on some servers.