I don't think there will be Bitcoins in 5 years. The protocol cannot handle enough transactions/sec without centralization. Bitcoin will be superseded by another coin.
enlightenment is the key!
Today the Bitcoin network is restricted to a sustained rate of 7 tps by some artificial limits. These were put in place to stop people from ballooning the size of the block chain before the network and community was ready for it. Once those limits are lifted, the maximum transaction rate will go up significantly.
If you remove these limits you may go around 40 tx/sec, but never to 10000 tx/sec visa scale, unless you centralize the network on few big nodes, and the rest have only a portion of the blockchain.