The best replacement for wcf is asmx.

The best alternatives to wcf are rated as following:
★★★★★  asmx
★★★  remoting
★★★  web services
★★★  mvc
★★  web api
★★  web service
★★  rest
★★  wpf
★★  soap
★  windows service
★  asp.net web api
★  servicestack
★  .net remoting
★  asmx web service
★  asp.net web service
★  wcf data services
★  2005 extensions
  sockets
  odata
  ria
  asp.net
  wse
  api
  asmx performance
  asmx web services
  44 special
  msmq
  ws
  net remoting
  mvc for rest
  asp net
  entity framework
  iis
  ado.net data services

Your alternative for wcf is not listed? Suggest!
Speaking about wcf, one probably shouldn't forget about rest.

Other search terms related to wcf and their ratings are:
★★★★★ rest
★★★★ mvc
★★★★ https
★★★ json
★★ msmq
★★ ef
★ windows authentication
★ entity framework
★ forms authentication
★ serialization
biztalk
client certificate authentication
named pipes
wpf
svc file
.net
basichttpbinding
You have in mind a companion for wcf and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of wcf in all years. Click on graph for more.
wcf
asmx
remoting