Sure, but without DANE, they can get a domain validated certificate quickly from any number of CAs that your clients probably already trust.
(edit) I understand DANE puts explicit trust on the registry, registrar, and the DNS root; but given the common use of domain validated certificates, that trust is already there, and I think it is better to have it explicit. Also, there are fewer parties to watch out for, the Belgium Root CA can issue a cert for my domain, but Belgium is unlikely to compel my registry/registrar unless I've chosen to have a .be domain. (My applogies to Belgium Root, if they're not affiliated with the government of Belgium)
Also, I don't think cert issuance can scale without domain validation or a large expense.
(edit) I understand DANE puts explicit trust on the registry, registrar, and the DNS root; but given the common use of domain validated certificates, that trust is already there, and I think it is better to have it explicit. Also, there are fewer parties to watch out for, the Belgium Root CA can issue a cert for my domain, but Belgium is unlikely to compel my registry/registrar unless I've chosen to have a .be domain. (My applogies to Belgium Root, if they're not affiliated with the government of Belgium)
Also, I don't think cert issuance can scale without domain validation or a large expense.