The WTS did take a rather clumsy stab at this seemingly insurmountable problem in the Insight book (which was cut and paste from the Aid book)...
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it-2p.792Resurrection***Resurrection
During1,000Years. A very liberal estimate of the number of persons that have ever lived on earth is 20 billion (20,000,000,000). Many students of the subject calculate that not nearly so many have lived. Not all of these, as it has been shown in the foregoing discussion, will receive a resurrection, but even assuming that they did, there would be no problem as to living space and food for them. The land surface of the earth at present is about 148,000,000 sq km (57,000,000 sq mi), or about 14,800,000,000 ha (36,500,000,000 acres). Even allowing half of that to be set aside for other uses, there would be more than a third of a hectare (almost 1 acre) for each person. As to earth’s potential food production, a third of a hectare will actually provide much more than enough food for one person, especially when, as God has demonstrated in the case of the nation of Israel, there is abundance of food as a result of God’s blessing
The WTS illustraters seem to take a different view with their depiction of delightful lake front properties in the paradise where the nearest house is a mile across the water.
Slightly OT , but I know of many JWs who have had miscarriages who believe that these unborn babies will also get a resurrection , so that would swell the numbers even more.