"Based on our calculations, we think our estimate of 18-20 million units [by end of March 2014] is likely in-line with the company's internal estimate. We see potential for worldwide day-one sell-through of 6.5 million units [and] $400 million for GTA V." - Arvind Bhatia and Brett Strauser
"Given the significantly higher installed base of relevant console platforms at launch, greater sales concentration among the top video game franchises, and unprecedented pentup demand, we expect GTA 5 to outpace GTA 4 sales, and generate roughly $1 billion in retail sales during the first month." - Colin Sebastian
Though these predictions are made by analysts, it's hard not to take their word for it. Grand Theft Auto V already seems to be selling incredibly well. If these were the original goals for the developers, I would say that it shouldn't be that hard to reach them.
Do these predictions seem too high to you? Do you think that they will reach them? Let us know in the comments below!