When God’s will is done on earth, will people still get sick or die?

No.

When Jesus was on Earth he healed the sick. (Matthew 9:35; Mark 1:40-42; John 5:5-9) The Bible shows that as ruler of God’s heavenly Kingdom, Jesus will do healing on a far grander scale than when he was on earth:

"At that time the eyes of the blind ones will be opened, and the very ears of the deaf ones will be unstopped. At that time the lame one will climb up just as a stag does, and the tongue of the speechless one will cry out in gladness. For in the wilderness waters will have burst out, and torrents in the desert plain." (Isa. 35:5,6)

"And no resident will say: “I am sick.”' (Isa. 33:24)

Jehovah God can and will undo the cause of sickness and heal all our "maladies":

"Him who is forgiving all your error, Who is healing all your maladies." (Psalm 103:3)

“Look! The tent of God is with mankind, and he will reside with them, and they will be his peoples. And God himself will be with them. And he will wipe out every tear from their eyes, and death will be no more, neither will mourning nor outcry nor pain be anymore. The former things have passed away.” (Revelation 21:3, 4)

For more, see:
Earth

Are the paradise conditions described in Isa. 11:6-9 a literal or figurative promise?

Why did God create deadly microrganisms? (jwitness forum)

Articles from the WBTS:
When Sickness Is No More!

Does the Devil Make Us Sick?

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