Some registrars do seem to have problems running their own TelHosting, particularly with expired domains that change ownership (sometimes before the scheduled deletion date/time).
I'm sure many would be happy to let Telnames handle the TelHosting (for a small annual fee that is added onto the domain's cost) and concentrate on what they do best i.e. domain registration, renewal and transfer.
My guess is that it could be Name.com, or maybe Moniker (since they are now owned by the same company that runs the registrar that Telnames has partnered with).
Once one takes the plunge, others will follow quickly IMO.
http://MikeSeaton.tel