Use of Old TTML1.0 CR Namespace URIs

I've been noticing some TTML content generators still using the old TTML1.0
CR namespace URIs, which used a prefix of:

http://www.w3.org/2006/10/ttaf1

This was changed to the following with the publishing of the 3rd CR of TTML
1.0 on 2010-02-23:

http://www.w3.org/ns/ttml

This presents a significant interoperability issue for attempts to promote
validated TTML1.0 content. Should the WG reach out to tool vendors to try
to curtail this usage?

I also noticed in this content use of the old ttp:smpteMode parameter,
which we renamed to ttp:dropMode when we published the second CR on
2009-09-24.

Are there TTML processors out there that are silently accepting this
invalid usage which should be "fixed" to reject this no longer valid
content?