Infinite problems require inifinite solutions

[YandeBunny]

Just create pay wards and charge people $5 a month for a small, $10 for a medium and $20 for a large.
People will just fund the servers that way.

Like everyone's FFXIV sub, your account is always going to be there and ready for you to leap in-game because you have paid for your month. This would be the exact same case for the houses being on a sub-plan, so I have to say I would stir away from this idea.
This would mean they would be relinquishing the Demolition system; because people are paying to hold there plot at this point. This would mean people could go inactive for months...maybe years, and their plot is still on a sub plan and just sitting vacant because they're MIA doing who-knows what. They would have no concern of there plot getting demolished at that point..

I personally think a shorter demolition period would suffice, honestly.