The best replacement for mqtt is xmpp.

The best alternatives to mqtt are rated as following:
★★★★★  xmpp
★★★★★  amqp
★★★★  zeromq
★★★★  websocket
★★★★  dds
★★★  alljoyn
★★★  gcm
★★★  jms
★  rabbitmq
★  c2dm
  coap

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Google Trends

Scale is based on the average worldwide traffic of mqtt in all years. Click on graph for more.
mqtt
xmpp
amqp