Should merchants equip themselves for contactless?
Not really as far as cards are concerned, since all current terminals are compatible.
In fact, all card terminals are physically equipped to accept contactless payments. This concerns both physical cards and smartphone payments; there is no difference for the terminal, as long as the communication takes place via NFC.
On the other hand, there may be software bugs when using digital wallets. Update the terminal software if you bought it second-hand.
Not accepting Apple or Google Pay is a potential cause of turnover loss, which is why all leading card machines are compatible with Apple Pay and Google Pay.
And if a merchant does not want to get a card reader, there is always the option to use an Android smartphone for tap-on-phone transactions!