Free, instant transfers are already the status quo in a lot of the world, as of course they do not require blockchain. SEPA Instant Payment in the EU, for instance. In fact they're way faster than a Bitcoin transaction much of the time - and obviously way less expensive ($0 vs. $5-60).
The US is moving to 24/7 free, instant payments as RTP rolls out. [1]
The US has been quite far behind historically on this front however they are closing this gap, probably motivated in no small part by Bitcoin.