My understanding of color production: Your video card is capable of producing deep color. This has been possible for some time since color/content is produced on computers nowadays rather than in larger than needed color rooms with older tools (pre-computer press days)
So, video card isn't your limitation; it is capable of producing deep color. Read the GTX760 userguide and it specifies this:
http://www.nvidia.com/content/geforce-gtx/GTX_760_User_Guide.pdf
Page28 lists the HDMI specifications. Dual-Link DVI is capable of deep color as well.
Onto a very laymen term website but decently spelled out to "us less educated users(not producers)"
http://www.soundandvision.com/content/xvycc-and-deep-color
Note: that article is 7years old to almost the day.
It comes down to the weakest link in the chain. If you're producing content then deep color reproduction is important. But, if you're producing content in a world that still has mostly 8-bit color panels, where blu-ray is still using 8bit, then you're producing colors that won't be seen by the large majority of users. Content consumption is changing - standards are changing - technology changes - 4K, better panels, etc...
Quoting from blu-ray wiki:
For video, all players are required to support H.262/MPEG-2 Part 2, H.264/MPEG-4 Part 10: AVC, and SMPTE VC-1.[128] BD-ROM titles with video must store video using one of the three mandatory formats; multiple formats on a single title are allowed. Blu-ray Disc supports video with a bit depth of 8-bits per color YCbCr with 4:2:0 chroma subsampling.[129][130]
Future proofing yourself? Perhaps. This industry is changing quickly as a result content production changes. No longer is content ONLY produced by the big production houses. So being visually appealing, and innovative will go a long way.
In the end: As a non professional i might be wrong; but i don't think the color bottleneck will be your video card. It will be the panel that displays your content to the person viewing it.