If this gets the attention of developers, this will greatly help Avalanche in terms of stability, popularity, and market growth. For sure those who will take advantage of this project need Avalance coins to execute transactions and contracts. This will put demands on the Avalanche market thus pushing the market price up. It is indeed an innovative and genius move by the Avalanche team.
Yes, some projects have already shown support to Avalanche subnets, announced a launch and some developers have said it is a very interesting technical opportunity because of it's potential.
More subnets will lead to increased interest in Avalanche Coins.
Maybe we will see a list of upcoming subnets soon, when Avalanche does a publication about it.