I would totally use XT as a sidechain, and may even support it from an infrastructure perspective though most likely the google-type entities will subsidize my use and very possibly will give me 'cash back.'  As long as XT is open source that I can compile myself and verify the 2wp implementation, I've got no problems doing so.

I would even use XT if/when it sprouts blacklisting since that will probably be a requirement in my jurisdiction and vendors will not realistically be able to use an 'unsafe' currency solution.  When I want to buy trinkets from TigerDirect I don't really give a shit about these things.