DAC sampling rates

What is the benefit of a soundcard or DAC that supports 24 bit/ 96 or 192 kHz? Is it future-proofing? Will my computer (or my next computer) be able to read SACD or DVD-A? I believe that there are some formats ( FLAC, APE) that support these higher rates but I haven't yet seen a Mac compatible player for these formats. Also, am I correct that computer based DAC is a more generic/ less specific type of device than an audio based device? I ask this because I understand that audio DAC's are for the most part only 'redbook.' THANK YOU.