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Well, if you are asking with job point of view then let me tell you that PCI and other communication protocol and techniques are very much necessary for the companies like juniper networks, nvidia etc. This was the suggestion made by the people who attended interviews for those companies.
i had a sales agent from National Instrument coming to myself to explain on DAQ system we are purchasing. he mentioned NI will be focusing on PCIe products in near future (recommending me to buy system that can support PCIe products). so maybe would be safe to say NI demands on PCIe is high?