Shower thought - what is going to happen to DNS based URL filtering services like OpenDNS (Cisco Umbrella) now that DNS over TLS/HTTPS is coming

Right now it is trivial to block outbound DNS to non-authorized resolvers, but it seems to me that it will be a lot harder to block TLS/HTTP resolvers because it'll be mixed up in the rest of the traffic.

Any thoughts? Does this kill DNS URL filtering?