Eureka! is a telephone and Internet-based concierge service that specializes in obtaining things that are hard to find (e.g., Super Bowl tickets, first-edition books from the 1500s, Faberge eggs) 

 It currently employees 60 staff members who work 24 hours per day (over 3 shifts) Staff members answer phone calls and respond to requests entered on the Eureka! website.  

Currently, each staff member has a desktop PC with two monitors and a twisted pair connection (Cat5e) that offers speeds up to 100Mbps.

Some employees made a suggestion to the CEO of Eureka! to upgrade their connection to a fiber-optic cable that can provide speeds up to 1Gbps.

What do you think about this idea?

How easy (difficult) is it to change the wiring from twisted pair to fiber optic?

Can we use the same network cards in the PCs, or do we need to change them? How much would this change cost?