Bitcoin would always be affordable and everyone can always purchase what amount of it they can (with capital they can spare of course). An increase in value does not push it away from any class, as long as demand is still increasing, the value would as well (especially as the supply flow is thinning). Also Bitcoin is not a social tool, it's a peer to peer network, anyone can need it for different reasons.

The ironic idea is, if Bitcoin's value has not skyrocketed over the past years and it was still at a very low price, most people who you claim 'need it' would not be interested. It's the price spikes that makes most aware of Bitcoin.