Red Bull did this and didn't even get a proper punishment for it. Maybe all the big teams will do this respectively until FIA decides upon a serious punishment for that. This move can help Hamilton very much about getting closer to his 8th title in his career as well. But even with the help of that I believe we would still see a tough competition among Mercedes, Red Bull and Ferrari. It depends on whether Ferrari screw things up again after making a good start of course.
I think that every year that passes makes the chances for Hamilton to win the 8th title slighter and slighter.I think his age is starting to show and the fact that his team mate did better than him the last season says a lot about Hamilton being restricted by age and this is not a single thing that is happening only to Hamilton.Just remember Michael Schumacher when he returned with Mercedes at an age even higher than this of Hamilton,sure he was 7 times Champion like Hamilton is but he was not capable of even a single good race and yes I know that Mercedes was not that good at that time.
So most likely I see young drivers like Verstappen and Leclerc together with Sainz and Norris if McLaren step up their game as fighting for victories for this upcoming season.