Don't forget that the vast majority of those are unskilled labours directly working on the huge construction site which are now redundant. So the estimates you gave will not accurate. I would like to offer the following correction:
101,250 people, 50% of them are unskilled labours, living in labour camps (50,625 are skilled labours or Professionals)
Out of those 50,625, I believe that at least 50% of them are living in shared accommodations, (lets say each 3 our of those 50% are living in 1 Shared accommodation) which means practically that the number of accommodations which will become "to let" will become:
50,625 * 0.5 + [(50,625 * 0.5) / 3) = 33,750 apartments.
Still not a small number...
But I do agree that we are going to witness a huge drop down in prices rental prices...
From what I could see so far, judging by the economic cycles, people who bought in June or August last year will either have to wait between 3-5 years until the prices go up again (even for those who bought directly from the developers like me with no premium).. or they have to sell for a very considerable losses...
and it will go up due the progressive development in the area and in Dubai in general.
As for the next 3-5 years, renting will only cover 30-40% of the yearly mortgage for those who recently did their purchase