I'm not much of Skype user, but some thoughts:
I'm not clear how MS have cut off older devices. Maybe it's an API update (assumed to be proprietary) or it could be done by device ID. This could be spoofed, so there's a slight chance someone might find a work around with this or some other method, but unlikely. EDIT: Ah! See above! ;-)
What if we could find a Skype app elsewhere?
FirefoxOS is another web-based OS. I see no sign of a Skype client. Perhaps someone with a device or a web link to the marketplace can clarify. If there were such an app it might run on webOS or require just a few tweaks to do so.
webOS is a linux based OS. There is a skype for Linux... Could that work? Download Skype for Linux
You can also get Skype for TVs. A big screen videophone is a good use-case and MS offer Skype for a number of models. It would also seem likely that TV makers would be eager to get the service on their sets. From this list, http://www.skypeassets.com/content/d..._TV_Models.pdf it seems that Skype is available on LG TVs, but there is nothing listed after 2013. If a Skype app arrives for LG webOS TV's, it could well be coded in Enyo. Is there any chance of such an app being modified for mobile?
Current options would seem to be using the Android version on a dual boot TP, ACL or just possibly under Android Chroot on Pre3...?
I'll add Skype to the list as a zombie until any resurrection options are exhausted.