Just H links much appreciated.
Yes for sure we cannot discount it as, as you say, we are half way there.
And as we have the web services to register and enrol users, and to create courses we at the moment are not looking at changing Moodle code. The only slightly against political correctness thing we have planned is dragging the results out of the Moodle database but that is of course read only. So one advantage of LTi would be that it leaves our Moodle with code clean.