Would you? We've seen, what, a dozen (at most) CAs do inappropriate things in the last several years? And there are hundreds of CAs? I think things would be fine.
In particular, there are lots of intermediates. My personal website's cert is from Gandi, which uses an intermediate chained off USERtrust. Gandi could arrange to have a second root CA sign their intermediate, so that if USERtrust gets kicked out, browsers can still construct valid chains. And I would gladly pay for such a feature from an intermediate, if the alternative were either my site being at risk of being marked untrusted, or SSL becoming meaningless.
Would you? We've seen, what, a dozen (at most) CAs do inappropriate things in the last several years? And there are hundreds of CAs? I think things would be fine.
In particular, there are lots of intermediates. My personal website's cert is from Gandi, which uses an intermediate chained off USERtrust. Gandi could arrange to have a second root CA sign their intermediate, so that if USERtrust gets kicked out, browsers can still construct valid chains. And I would gladly pay for such a feature from an intermediate, if the alternative were either my site being at risk of being marked untrusted, or SSL becoming meaningless.