RTGS offers a simple way of settling funds where the central bank immediately executes payment instructions received from financial institutions. Under an RTGS system, as each payment is settled with finality in real time one after another, systemic risk can, to a large extent, be contained.
Bearing that in mind, I would consider it disastrous if the general public were to be given the impression that the mooted abolition of the € note and imposition of caps on cash usage were the first steps towards abolishing cash entirely.