You can also look at it another way:
The soft tyres tend to go off very quickly.
Hamilton will look to come in for new tyres very soon, probably even as early as lap 15-20. He will then take his mandatory pit stop (assuming they go for a 1 stop strategy), at which stage the RedBulls should be able to open up a little bit of a gap.
Meanwhile Hamilton will come out on the harder tyres. He will be lapping slightly quicker (newer tyres than the RedBull cars). RedBull will, at around 2/3rds race distance, come in for their stops. The final third of the race, they will be running on soft tyres, which will go off very quickly.
At this point, providing Hamilton is within striking distance, the RedBulls will be extremely vulnerable to a rampant Hamilton. We know he will be rampant, because he has been so in virtually ever race so far this season.
Also bear in mind that RedBull tend to be stronger in qualifying than in the race, so in the race, Hamilton might not be that much slower than the RedBulls, if at all. In race trim, I think the RedBulls are going to be vulnerable and McLaren could well be as close to RedBull as they were in the last race.