The thing is, they come up with this plan on a regular basis. If it worked these high end tourists would already be coming anyway.
They could look at making it easier for foreigners living here. It doesn't say how long these tourists stay in Thailand, but let's say 4 weeks, 28 days. If they spend at the top end mentioned, 7,000 baht per day, that's 196,000 baht. A foreigner living here and spending 537 baht a day would amount to 196,000 baht over the year. Plus they aren't likely to say to their wife and family "I've never been to the Maldives, we should go there next year. That would seem a much better option in the long term. However that would make sense so rather lacking in Thainess.