[rarestia]

You won’t need to initially, but like everything, 8 will eventually sunset.

Microsoft is pushing their EOL timelines to might tighter standards, so Win7 will likely fall off mainstream support quicker than previous operating systems with Windows 8 soon to follow.

[Dalberg-Acton]

"Win7 will likely fall off mainstream support quicker than previous operating systems"

Products Moving from Mainstream to Extended Support
Already happened on January 13, 2015.