Roughly 10% of TLS connections use RSA key exchanges instead of DHE/ECDHE. https://twitter.com/colmmacc/status/1068546791522525185 …pic.twitter.com/pOLeHclxPK
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Yes, that seems plausible.
Mozilla telemetry gives around 6% for rsa kx (https://mzl.la/2BQjcMO ). It is enough that they won't deprecate it. The main problem is not those 6% but the risk of a downgrade attack to the other 94%.
Why wouldn't resumption handshakes be affected if it's a bleichenbacher style attack which decrypts the PMS?
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