Yes. They absolutely risk being fuel on the fire. I get the instinct behind these measures. My concern is that they're rooted in an impulse to always try to adhere to the market logic and let the market work the way it wants to work. But where housing is at, we need to look to the side of how the market is pricing these things.
While measures like encouraging savings to be able to buy a house will benefit some individuals and help them access the housing market, you're absolutely correct that they will just help propel housing prices up further. Speculators, who already have access to plenty of capital and aren't being restricted as much as they need to be, are going to anticipate that and already be piling in.