but there's absolutely no reason to extrapolate that boosts will be available in Destiny 2. Quite the opposite. Why would you want people to skip your content?
The boost now does one thing, it gets new players to the minimum level required to play contemporary content. To play content that other people are playing. That's it. It makes less than zero sense for it to be offered for Destiny 2. It would be cutting people off from content, and as much as people bag Bungie, they don't actually want to make hardcore players completely irrelevant. I'd be absolutely staggered if a boost was offered in Destiny 2, until a similarly mature stage of the lifecycle such as now in Destiny 1
Why would they want you to skip their content? Because they earn an extra $30 or $40 from it. Make the grind big enough and I'm sure you can encourage lots of people to pay just that little bit more for the game.