You do need to multiskilled.
My main area is Telecoms / Contact Centre design...
But how can you do telecoms these days if you don't know VoIP? How can you do VoIP if you don't understand networking, how can you do networking if you do QoS, how can you don't understand the need for QoS? How can you support the end user and understand their needs, if you don't understand the software?
I'm proud to say I came from desktop support, then network, then old school telephony to cutting edge multinational contact centres, but still retain knowledge in the areas I need.
So I CAN get the bloody software working on a Win8 machine, I can do a Wireshark trace and smack the networking team around the head with a keyboard to show it is their problem and I can understand why the business is getting annoyed because what they want isn't working how they think it should do.
There is nothing worse than someone that is so focused on their "skillset" that they have no concept of the other people involved.