SSO transition - How painful will it be?

[dschreiber]

Hello,

We're hoping to eventually give our clients a single-sign-on solution for our product, community, and support applications.  I'm hoping to use Auth0 (https://auth0.com/) as the master SSO application.  I'm aware that I have two options to implement the SSO: 1) Hire Invision to do it, or 2) Create a plugin myself.

Here's my question: If we decide to use IPS Community as-is right now and postpone the implementation SSO, will it be painful later to migrate our users to the new authentication method?  I want to make sure that we don't put ourselves in a position where we'd need to have our members to re-sign up.

Thanks for your feedback,
Bret