Some of you think that devs will continue providing demos after this rule takes place.
I'd say you're very optimistic.

Why would devs invest time into making a demo when the data shows that it hurts sales?

Some will make demos, sure, because they want the players to love their game before purchasing it, but most will not provide demos in the future IMO.

Besides, once the first non free to try games hit the store, all the others will follow because "others are doing it too".

You don't believe me?
Show me a platform that doesn't have a demo requirement and where the majority of games have a demo. Take your time, I'll wait.