SIM cards have no place in the future.
The future (as Verizon's CEO said it) is 500% wireless penetration --- 400% of those are things like smart meters. It makes zero sense to put a SIM card in a smart meter. This is why the GSMA is getting rid of SIM cards in the future.
http://gigaom.com/2010/11/18/carrier-organization-changes-rules-to-allow-the-apple-sim/
This is really what would make most sense. many more devices besides phones will become connected and really not need an interchangeable sim card. From the manufacturing and supplychain point of view this will also greatly help to reduce costs and points of failure a removeable sim card could have.