Does Marketo have plans to make HTTPS easy and not a pay-to-play feature, given the obvious push to require HTTPS?
Google Sets Deadline for HTTPS and Warns Publishers to Upgrade Soon - Search Engine Journal
I've never heard anything about it going free (this would be unlikely given that Marketo does not run their own CA and so does need to pay for your cert every 2 years). It is now a lot more affordable than before.
Marketo a recently made the HTTPS much easier, but nit free. In their new HTTPS (Setting Up Secured Domains for Landing Pages ) you have to pay a yearly fee and they take care of everything, including the provision and renewal of certificates.